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Columbining

To attempt to waste many people in your school.
On April 20, 1999, in the suburban town of Littleton, Colorado, two high-school seniors, Dylan Klebold and Eric Harris, enacted an all-out assault on Columbine High School during the middle of the school day. Shooting guns and throwing bombs, the two boys killed twelve students and one teacher and injured many more. That is columbining.
Columbining by Cyniper September 7, 2008

cucumbering 

Inserting a cucumber into a vagina or anus, or both.
A good cucumbering is just what the doctor ordered, Ronnie said as he took that grandma's ass to double pound town.
cucumbering by @AronymouslyGay December 7, 2015

cucumboning 

The act of gay sex, in which a man cuts a penis-sized hole into a cucumber, slaps it on his dick and repeatedly bangs his man friend until the cucumber turns to slop. This can be very fun for both men.
Lad 1: Maaan, cucumboning is so fun, I can't wait to be cucumboned by my bae tonight!
Lad 2: You're such a dirty scrub.
cucumboning by Worrying Anal Seepage November 24, 2014

cucumbernimbus

A sarcastically bad mispelling of the word cumulonimbus, a type of cloud.
I hate learning about clouds. Everything's so boring. I don't have time for this cucumbernimbus bullsh*t.

Columbining

To attempt to waste many people in your school.
On April 20, 1999, in the suburban town of Littleton, Colorado, two high-school seniors, Dylan Klebold and Eric Harris, enacted an all-out assault on Columbine High School during the middle of the school day. Shooting guns and throwing bombs, the two boys killed twelve students and one teacher and injured many more. That is columbining.
Columbining by Cyniper July 26, 2006

Cucumbering 

To get a cucumber and forcefully shove it up a hole on a humanoid and wiggle or rub in a up and down motion until it is very moist then licking it
I told the alien cucumbering was fun and he said he wants to try it