Sip Stealer
A "sip stealer" is one who after filling his cup at the self help soda fountain. Looks to see if anyone is watching then quickly gulps his drink to make room for more and quickly pumps more soda into his cup.
J.D.was seen standing close to the drink dispenser filling his cup then gulping it down quickly and slyly putting his cup back under the dispenser again as if he was getting it for the first time.What a "Sip Stealer"!