Momplement 

To complement someone regardless if their performance / quality is poor or not impressive.

“Oh little jimmy I know you made a mistake and made the team lose all their chances but you’re still the best” is the act of giving a momplement

Momplement by Fishhook November 2, 2018

Mompliment

When your mother feels so bad for your pitiful self that she feels the need to tell you ridiculously untrue things about yourself.

Of course your mom told you you're the handsomest little prepfag at your private school, it was just a mompliment.

Mompliment by D. Money February 24, 2008

complementary flush 

flushing toilet right after a turd hits the water as to not stink up the bathroom for the next person

hurry up I gotta take a dump, and how about a complementary flush

complementary flush by somethree May 9, 2013

National complement a girl day 

On national complement a girl day u complement a girl say she's pretty say she is nice

Randy:sup ur eyes are beautiful
Samantha:😚 thanks so much y do u say that
Randy:it's national complement a girl day

National complement a girl day by Joshua6969 January 18, 2020

Complement 

To go well with; to complete.

That lamp complements your desk perfectly.

Complement by Diggity Monkeez March 3, 2005

Cute(Complement) 

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!"

Cute(Complement) by Deplrshukiwa April 8, 2013

complement 

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*

complement by Evariste Galois April 20, 2009