I understand what you're saying now, only after you explained what is a misuse of terms.
I sports gamble on the regular. Go to a sports book and say 'I'm taking the under'. It will not be what you are talking about in this post.
All you have to say is I'm taking the Giants, and the points are included, implied, whatever the fuck.
Say you're taking the under, and you are betting the total score of the game to be under a certain amount of points.
That is all. You should win this bet, if scary decides to take it.