Taking something that was awesome and overusing it so much that it starts to suck, and become annoying. Usually done by the annoying outsider in the group who doesn't know when to stop. Ofter this occurs by going too far with it, as well.
Person A - Hey remember when blah blah blah...
Person B - That was a month ago. It was barely funny then, and it isn't funny now. Overkill!

Person A - Man, the only way you could have gotten that mark was by sleeping with the teacher!
Person B - Shut up.
Person C - Yeah! You must have like. Spread your legs to pass for anything, and screwed every teacher up the ass!
Person A - Yeah, you just overkilled it.
by More Awesome Than Thou November 14, 2005
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the practice of doing something to much or repeating the same joke. mostly used in humor or competitions.
knock knock!
whos there?
tiny!
tiny who?
tiny fucked a stump!
haha.
dude he fucked ir hard.
yeah.
n fast!!!
really?
n the he droped a huge load of jizzu-----
ok fag, dont overkill it.
by Madd Jester September 6, 2003
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Graffiti beyond what it is needed. beyond killed.

also refers to doing someting stupid with graffiti or ddoing something corny.
Dude, I know your out to kill that shit but you can't even read your name anymore! that shit is overkill...
by DigDug March 8, 2004
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A very large man who wears black everything and likes to punch random people at random times. Extremely powerful, he can even eat stale french bread. He enjoys jokes that involve hurting others. He calls them "knee-slappers".

He is the ruler of the Dark Clan and creator of the "Darklings". Ryo's best friend and worst enemy.

He also enjoys cookies. :)
Oh Shit! It's OVERKILL!

OVERKILL just stole that guy's pizza!

Ryo: Hey OVERKILL, what's up?
OVERKILL: It's over 90403493812723458467954872348356!!!!!
Ryo: Shut up.
OVERKILL: LOL KNEESLAPPER!
Ryo: Shut up.
by OVERKILL AWAKENED April 9, 2008
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To speak in an over exaggerated tone in a disgusting manner to convey a point.
Morty: "... If you really want your grandpa back, grab a shovel, because the one that won't let you down is buried in the backyard."
Summer: "Your right!"
Morty: "What! No! I was using ghoulish overkill!"

from Rick and Morty, Season 3 Episode 1
by budobla April 5, 2019
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To achieve a goal in an exaggerated and barbaric attempt, often involving physical harm.

Used in Rick and Morty Season 1 Episode 10
Related to Ghoulish Overkill
Morty: "Why would somebody do this! It's horrible."
Rick: "Well one Morty is enough to hide from the bureaucrats, but if you get a whole matrix of Mortys and put them in agonizing pain, that creates a pattern that can hide from even other Ricks mothufucka. I fiddled with a concept like this once.
Morty: *Stares in shock*
Rick: "On paper Morty, on paper! I wouldn't do this it's Barbaric Overkill! I mean, you could accomplish the same results with five Mortys and a jumper cable."
Morty: *Stares in anger and shock again*
Rick: "Which I also wouldn't do!"
by budobla April 9, 2019
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