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1.
Storing several loads of semen inside your vagina, until it begins to smell like the ocean or seaside, then trying to put that vagina on someone's face.
Man: What smells like a fish market?
Woman: I'm Crabshacking you when we get home!
af Tostig_the_Bastard 2. september 2014
 
2.
When someone posts images that aren't them on a dating site or app (see cat-fishing), but you still fly across the country to meet them, you end up sleeping with them, and get crabs.
"So I met this hot girl on Tinder, she sent me shots of herself in a bikini, we made plans for me to fly to Chicago to meet her, and then I got crabs. Textbook crabshacking."

"I couldn't help myself. He was so cute and sent me hipsterporn. I had to crabshack that fool."
af McFuckersons 23. november 2013