Submitting this because all the definitions are wrong. This term originated back in the 90's when Jack in the Box made national news from a bunch of stores getting people sick with E. Coli bacteria, which is basically from shit contamination. Hence, Jack in the Crack was born.
by Jathra September 25, 2020
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The explosive diarrhea that ensues the morning after a late-night Jack in the Box run, due to the copious amounts of cat food and grease in their tacos and burgers
Brah, I was so faded last night and got 99 tacos for two cents at Jack in the Box, now I've got jack in the crack
by flossangeles December 19, 2009
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When you bust your nut solely from stroking your meat between the ass cheeks of your partner. There’s no penetration. Just friction from that ass crack.
I did the old crack jack last night and nutted all over the small of her back.

I did a crack jack last night with no lube. The skin to skin friction was intense.
by Eaton Holgoode October 11, 2018
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hey mate I am going for a walkabout to jack in the crack want to come I am gonna get a burger and thorw up
by williamtell April 12, 2006
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Similar to Jack in the boxm except instead of a guy ejaculating in her pussy its up her ass
Did you see Anal Bitches #34?
Nothing nut Jack in the crack
by lordonightmares December 12, 2006
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a totally douchey way of saying jack in the box, sometimes that "x" sound in "box" is too hard for people to pronounce, so they just go with the least funny alternative.
Jack: Hey Jill, Let's go to Jack in the Crack
Jill: What, are you retarded? It's Jack in the Box, that's the name of the eating establishment, and if you respect them or enjoy their food in the least bit you could refer to them by their actual name, or at least a more respectable, less douchey alternative. Dumbass.
Jack: I am sorry. I will never say Jack in the Crack again.
by poopzone November 28, 2007
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