When you take a dump, then jack off in the bowl after you're done. Usually this is to save water and not flush twice, or to cover up for anyone in the house.
Can also be taking a dump right after you finish jacking off.

"I'm gonna go take a dunp-n-jack"
"Cool. See you in 30"

"I told my mom I was in the bathroom when I did my dump-n-jack"

Dump-n-jack by create1ders October 17, 2011

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Oregon Slap Jack

When you are receiving a blowjob and whip out your dick to start slapping your girlfriend in the face as fast as possible, making a sound like you are flipping flap jacks.

Bro, my girfriend was giving me a blowy last night and I just started doing the Oregon Slap Jack on her for no reason.

Thats phenomenal bro.

Oregon Slap Jack by BigGayScoob March 19, 2016

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Pullin' a Jack

When a person ditches a class, while there is a major test.

There are 5 tests tomorrow at school, I am going to be pullin' a Jack.

Pullin' a Jack by Aziz August 8, 2016

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Not as nice as jack

This is usually used as a term that limits as someone's niceness that is used to show the limit of how nice someone can be. It says that there is always as nice as jack

Tim: I'm such a nice guy
Gregory: not as nice as jack

Not as nice as jack by The OG of the OG September 2, 2016

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