The act of ejaculating directly into the navel thus filling the belly button with jape. Only works with an "inny" belly button.
While boinking Bertha, I noticed she had an "inny" belly button with a nice reservoir. So, I pulled out and gave her a Jack Button.
by MiltonHighlander August 20, 2006
A certain action that sets someone into a pissed off state. Everyone's button is different, it really depends on ones annoyances. Commonly performed by bitch ass niggas.
Vic: Don't you hate when someone sends you a text from somebody else's phone?
Joey: Yeah, that shit pushes my Jack Ass Button.
Joey: Yeah, that shit pushes my Jack Ass Button.
by GorillaVic21 November 7, 2008