[Read if you want to slightly understand why you're cheering a certain way] So what do you need to know about fantasy football to pretend you know/care about fantasy football? Your fella's team consists of various players from different teams all over the league. That explains why you might find yourself watching a football game with two teams you have no allegiance to, nor knowledge of their existence, taking place in city you have never been, nor ever plan to go, to. So in this hypothetical situation, you're wanting one specific player to throw/score a touchdown. But, if the team scores a touchdown - it's not automatically good. I know that makes this more difficult. Basically you need a specific person on that team to be the football player that scores (or throws) the touchdown. For instance, if the quarterback of a team is a player on your fantasy team, and they hand it to the running back for a touchdown it's actually bad, because the quarterback (your guy) gets no points. The running back would received the points. Conversely, if the quarterback throws for a touchdown, you get the points.
[Read if you just want the tips to know how to respond to fantasy football game situations] In the above paragraph I went through a brief explanation of why it can be both good and bad if either team scores in fantasy football. But here's the rule of thumb: just mimic all reactions that your fantasy football counterpart has. If they cheer when someone scores, it means it's good for their fantasy team. If they get mad when someone scores it means it didn't help their fantasy football team when it could have, or it was advantageous to their opponent. 99% of the time, you'll know what's going on, but here's a few intro suggestions to get the party started.
1) If you find yourself watching a game involving two teams you wouldn't normally watch - it means there's fantasy implications. Ask, "who do you have [on your team of fantasy football players that's playing] in this game?". Instant success. You should get all [read: more] than you want to know from there on.
2) If you find that your significant other is mentioning a friend (or someone in their friend/work circle) with disdain when someone scores a touchdown during a game, just say, "He/she is such a lucky (expletive)".
3) Note: you'll often times find your significant other reading the "bottom line" to see stats from other games - or worse, looking at things on their iPad during games. That's because they're looking to see if other players on other random teams, that are on their fantasy team, have done anything noteworthy. Your call whether to ask, "how are you doing?". You'll immediately know based on body language. If it's bad; end it there. If it's good, or a conversation started, lead in with "who's [what players are] doing well? That should get you where you need to go.
Follow the above suggestion and you'll be fine. You'll also get bonus points for showing an interest in something that is important to your significant other for about 10 weeks of the year. If you're a lady that's playing fantasy football and find this offensive - well you probably haven't been reading my posts anyway - so that's just as well.
Happy Sundays, Ladies.