In Math, the complement is, simply put, that which is outside of the defined region. However, this is often used as an insult in geek circles.

Geek 1:Your momma's so fat, that she's the complement of your house.

Geek 2: Yeah, well at least my penis isn't always the complement of a vagina.

Geek 1: *shoots self, thus becoming the complement of existing*
by Evariste Galois April 20, 2009
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Complementary compliments
So amazing how your complements go with the dinner service, dahling.
by Hercolena Oliver April 20, 2009
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something you give to someone you like
something you add to food to improve its taste
She accepted the complement with good grace
by Philip Nash November 26, 2006
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A complement to a girl from another girl, in a non-homosexual way. When a girl calls another girl "cute" she's basically saying that they're sweet, nice, or used to refer to something little, or related to being young.

(People do this in my school, it's kind of a southern thing!)
Friend one: "You look so Cute(Complement) today, Your dress and hair is, like, adorable."
Friend two: "Thanks!"
by Deplrshukiwa April 9, 2013
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When someone gives you a complement that also helps you.
"Alright, people. I'm only looking for constructive complements on my performance as a boss."
by Toaborox13 July 6, 2016
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