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.
"Stacy quivered with excitement as Jennifer crab boiled her naked ass crack"
stay casual is an alternate fraise for "take it easy"; this fraise is most commonly used when bidding another fairwell.
Josh: latez buddy!
Brian: Stay casual bro!
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