Swear deep down on my knife

means the same as "deep down on my life" but instead it means you have to be socially known as an emo, to pull it off successfully

Kealan: did you steal my pen?
Sam: no, i swear deep down on my knife!

by sammymacbooey June 17, 2010

swear downs syndrome

When a person will say that they swear down to a multitude of statements, potentially even those that are not in fact true. They swear down so much that it even seems that they have a chronic obsession with swearing down, and their opinion becomes invalidated as such.

Guy 1: Blud swear down that lady always gives me onions in my burger!

Guy 2: Shut up, you got swear downs syndrome blud you chattin shit

Guy 3: SWEAR DOWNN!!!!!!

Guy 2: Shut up.

by tobytings May 21, 2011

sweardown

Similar to asking one to swear by something, this word is used in response to a statement that one suspects may not be true, or is very hard to believe.

"I just passed my driving test"

"You sweardown?"

"yes bruv!"

by zizu786 March 18, 2010