Similar to the "Swear Jar" or "Cuss Jar" you had to put a dollar into at home whenever you cussed, just modified for an older audience.
A bucket into which you must deposit a dollar for every cuss word you say.
Alyssa: "Yeah, he was fucked as shit."
Cait: "That's it, put two dollars into the Fuckit Bucket."
Alyssa: "Aw, man..."