When a man hunches over a woman and eats her out, though from behind. That is, she's lying on her stomach and he's crouched over her back, pulling her legs up, naturally, to eat her out more easily. She may or may not be wearing a Mexican wrestling mask while he does this.
by Leefy Greans April 8, 2006
Get the boston crabmug. Penthouse crabs are lice. They get their name from crabs, which are mainly found in the pubic region, who migrate, or "move on up" to the head, the "penthouse" of the body.
Did you see Brittney Spears scratching her head on Dateline the other night? It looked like she definately got a case of the penthouse crabs.
by Squirrely June 19, 2006
Get the penthouse crabsmug. 
by Slaalb May 10, 2016
Get the crab mcgrawlmug. When someone licks in circles around your butthole then sticks their tongue inside while while stroking your cock or fingering your pussy.
by AC MCMR September 12, 2017
Get the Crab pandamug. Like regular crabs, (the sexually transmitted parasite that lives in public hair) except several times bigger and more uncomfortable.
1. "excuse me, do you have anything for crabs?"
2. "sure, right over here sir"
1. "Mega crabs.."
2. "dear god sir, i beleive..your fucked'.."
2. "sure, right over here sir"
1. "Mega crabs.."
2. "dear god sir, i beleive..your fucked'.."
by Jim, King of Ghana November 28, 2007
Get the mega crabsmug.