An open handed, back-hand slap to the temple. Not intended to knock someone out, but instead, to make someone appreciate your point of view in a forceful manner so they eventually agree with you. This is considered a more intimidating and more painful form of "Point Making" as opposed to the more traditional and less painful open hand cheek slap.
Jeff: Hey Greg, Jimmy owes me some money and I asked him to pay me and he laughed.
Greg: He laughed?
Jeff: Yes, he laughed!
Greg: You need to Jack-Smack him and let him know you are serious without knocking him out.
A sex position where the woman puts a pumpkin on her head, while the man smacks her ass till it’s bright red and looks like a wild card. Also known as pumpkin fucking.
A type of manbag, but far more cool! Used by Jack Bauer of 24 to carry his awesome and unlimited arsenal of weapons to take on the terrorists that threaten the US
Jack: Dude, that manbag is so lame, you need to get yourself a Jack Sack