This is an insulting and derogatory description for somebody who is very, very cheap. It's believed that crab's asses are rather compact, so someone tighter than a crab's ass is about as selfish/cheap/greedy as it gets.
Jake: Bill by the way, what did you leave our waiter?
Bill: 15%.
Jake: Christ Bill you're tighter than a crab's ass. I have to stop eating with you if you're going to embarrass me like that again in public. That poor waiter worked his ass off you cheap fuck.
Bill: 15%.
Jake: Christ Bill you're tighter than a crab's ass. I have to stop eating with you if you're going to embarrass me like that again in public. That poor waiter worked his ass off you cheap fuck.
by Space Wrangler August 24, 2021
Get the Tighter than a crab's assmug. by Syrenia November 3, 2010
Get the Snow crabsmug. Bro my 5-inch double-decker pecker wrecker still hurts from that crab gluck your mum gave me last night... She got some real sandpaper hands.
by Leader of the Swaws September 15, 2023
Get the crab gluckmug. A person who is annoying, stupid and wears nappies. They love spiderman, frequently use the insult "Spoon" and tell people they have brain cancer.
by MoneyLebowski October 28, 2020
Get the jamie crabmug. pubic lice (sexually transmitted)
by ferdski April 29, 2023
Get the crabsmug. Pubic lice that have moved their way from from the genitals, through the mangroves of a man or woman’s gooch, only to take up residency in the general vicinity of one’s colon, hence the mud.
by UnkySnit10 October 13, 2022
Get the Mud Crabsmug. 