Before climaxing during a blowjob slamming your partners head down, thus making her deep-throat your penis and ejaculating down her throat.
When talking to my girlfriend she informed me the she spits and doesn't swallow. so mid-blow job I slammed her head down and gave her a jack in the box.
by MPASS August 5, 2011

by Toadstars September 9, 2022

by Spawj May 20, 2014

The act of taking an aborted fetus and inserting it into a girls rectum. Then when your friend is having sex with her, you run out and jump on her stomach, revealing the suprise.
My little brother was being annoying so i gave him a jack in the box.
When I gave him a jack in the box, he had sex with jack.
When I gave him a jack in the box, he had sex with jack.
by A-jizzle-jizzinmamouth December 20, 2008

by jojo548 December 16, 2008

by LA Lakers March 20, 2008

When one takes Adderall when one is still half asleep, whilst setting one's alarm to go off ten minutes into the future. When the alarm goes off, one will find oneself jumping up, suddenly wide awake. Popping up out of one's bed like that fey, much-celebrated children's toy of yesteryear.
Jack: Give me some of your 10 mg generics, I am going to need to pull a Jack-in-the-box this morning.
by skullskratching-soulsearching December 31, 2013
