by nepi January 10, 2010

For anybody who has a penis, it's whenever you see something that makes you extremely erect/rock hard.
by tetsuhikokariya October 26, 2015

1) The hardest natural occuring form of the 6th element of the Periodic Table (Carbon). When cut properly it can appear to be very brilliant due its refractive index.
2) A playing field, in the shape of a square, where the corners are bases. Used to play baseball and variations of baseball, like T-Ball, softball, and kickball.
3) A 2D geometric shape with 4 sides of equal length, but with differing perpendicular angles. Actually a rhombus, but commonly called a diamond when a corner instead of a side is at the bottom.
2) A playing field, in the shape of a square, where the corners are bases. Used to play baseball and variations of baseball, like T-Ball, softball, and kickball.
3) A 2D geometric shape with 4 sides of equal length, but with differing perpendicular angles. Actually a rhombus, but commonly called a diamond when a corner instead of a side is at the bottom.
by Anonymous June 29, 2003

by The husky lover November 9, 2018

"DUDEE! That jacket is sooo diamond;"
"Man, that girl Nina's so diamond..."
"Yeah then Mr. Rosenau totally fell down the stairs and smashed his face!"
"Hahahhaha, that's diamond."
"Man, that girl Nina's so diamond..."
"Yeah then Mr. Rosenau totally fell down the stairs and smashed his face!"
"Hahahhaha, that's diamond."
by Crackkbaby February 13, 2008

A guy who can't get a girl because all of them decide to claim him as a best friend. Every chick claims he's attractive, but every chick says there is someone out there for him. Probably not though.
by Kell Lee October 10, 2009

Known as girls' best friend
by mysterious_writa September 25, 2004
