like you're totally annoyed at this one person, just because of the fact that they feel fly, or that they were totally macking "this one time..." and they're just not. they totally have no game and just really fail at stuff that they describe. they're usually not mackin' at all, so you need to see it to believe it, but they probably won't show you. so they're being a jamhacky.

One: Yo, bitch I was like totally all up on that shit!!

Two: What the hell does that mean?

One: GIRL I was mackin' tonight!

Two: Well you're a friggen jamhacky.

jamhacky by CheeryCheeryGainGain March 21, 2010

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Jawback

When someone has a very big Jawline leading up to their forehead, Racists usually think only black people have jawbacks, but anyone can have them.

They dont always show on people because they have hair covering the jawback or the fringe.

If someone has a jawback they will have a massive forehead that looks like a giant bump on their head, Eg. Sakura from naruto.

Person 1: Wow you got sum big up jawback bruv
Person 2: You can see it? I need longer hair.

Jawback by HOO SHAA! August 20, 2008

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jawjacking

is when you are talking out of the side of your mouth. Meaning you aren't talking about anything of any importance or you are stunting.

Man don't listen to that braud she's jawjacking

jawjacking by Star.bee December 1, 2007

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