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1.
(v.) the sensless murder of a humorous statement

to take a joke too far
4th grade
Teacher: And the cow jumped over the moon.

1st person: (To Friends)The cow jumped over her fat ass (laughs)

2nd person: Yeah, and the cow jumped over her fat legs too!

Bystander: man you really greifed that one
by shooter June 03, 2004
 
2.
present tense of greif
Stay away from that dude. He greifs jokes all the time
by shooter June 03, 2004
 
3.
(n.) synonimous for 'dumbass'
When in need of a friendly insult...
"Shutup you grief!"
by BlackSheep June 16, 2004