Subway and Chill

An event that occurs when you go to subway to grab you and your girl a foot-long, take it to your/her place. 5 minutes into subway and chill is when sexual behavior begins to occur.

bf: "hey girl, I just bought us a sub, wanna eat some subway and chill?"
gf: "ok, I'll get my clothes off"
bf: "why"
gf: "what do you mean why? You bought me a sub so we fuck now."