Brantley Gilbert - Bottoms Up Lyrics Meaning

a lot of "country" songs are just southern guys sing about sex or wanting to have sex. true country songs are either singing about god or something clean. I think this song is a multiple meaning song. i think the words "bottoms up" mean more than just a drinking phrase. Here is my supporting phrases in the song "Make ya wanna slide on in" and "Tonight is bottoms up
Throw it on down". im positive he's talking about "her" bottom and the cups bottom. basically he's like get drunk and have sex. And he hides the sexual meaning in a well known phrase "bottoms up".