1. Similar to "Netflix and chill" but with Monday Night Football and not a thot. She knows that there are scheduled breaks for things like halftime and quarter changes, so she understands that the "chill" is implied to happen during those times.
2. Actually watching MNF whilst chilling... less preferable, but still potential for a great experience setting the groundwork for another Monday Night Football and chill, or perhaps even a Netflix and chill session.
Him: Hey, what're you doing tonight? Wanna come through for some Monday Night Football and chill?
Her: Sounds good, I heard it's another double header too!
Him: You don't say... I guess that just provides more opportunity for the chill doesn't it?
Her: Yep, see you around 650 so we can get settled before the first game starts