stay casual is an alternate fraise for "take it easy"; this fraise is most commonly used when bidding another fairwell.
by NWpolitik August 02, 2006
Basically it's when you motor-boat someones butthole. A sexual partner places his/her lips inside the butt crack of their partner and exhails forcefully while turning head from side to side. This will generate a motor-boat like sound.
by NWpolitik December 29, 2016