a)A motor-driven spiked chain. Can range in size from a couple of inches to several metres. The chain moves at a high speed, and with great power. It can do the work of a manual saw in a fifth of the time.

b) to use a) to destroy something.
"I need a chainsaw to cut down this tree."

"I chainsawed the tree"
by Kung-Fu Jesus April 15, 2004
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A person who frequently behaves and converses in a bizarre and disinhibited manner
'It was all fine. Then Dudley suddenly started chatting shit with this old guy, and then tried to fuck a tree. I swear he's an absolute chainsaw'
by T. Farmer October 26, 2007
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To ruin something. Accidental or not.
Our party got Chainsawed by those assholes who through up in the sink.

The bands show was Chainsawed when the drummer got wasted and passed out on the drums.
by Not You Too September 5, 2009
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Dancing move used mostly while dancing to fast electronic music, where the dancer slightly leans in and pretends he pulls the activating cord of a chainsaw (the dance move obviously refers to old, gas-activated chainsaws). Also known as "The Lawnmower" for obvious reasons. A perfect example can be found here:

watch?v=REKtfD5_ts4 (in youtube)
Dude, check it out! Ollie is doing the Chainsaw! He is so high!
by Crazygoat826 May 25, 2008
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what you use to cut off someones head and other body parts.
Jesse, where's my chainsaw? I need to cut this bitch up and get rid of the evidence.
by wackoo April 15, 2007
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A power tool designed to efficiently cut trees by means of a motorized chain with serrated edges, hence the term chainsaw. Chainsaws usually consist of a two-stroke gasoline engine, but with electric power being more commonplace, some chainsaw brands are electric-powered. However, in popular culture, the chainsaw has gained notoriety as a potential weapon or an instrument of torture and/or gruesome murder, most famously in the movies Texas Chainsaw Massacre, Hostel, and Scarface. The chainsaw has also been featured in video games such as Doom 3 and Resident Evil 4, where it has become an icon.
In Resident Evil 4, the player can be gruesomely decapitated by Doctor Salvador or The Bella Sisters, the main chainsaw-wielding enemies of the game.
by JumboJet Captain September 29, 2006
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a girl with braces on ecstacy who gives u a blowjob, but she gurns on your cock at the same time.
dude 1: Oh man, last night my girlfriend chainsawed me.... i was bleeding for hours.

dude 2: aahhh, man!... what a bitch. Slap that monkey!
by mildexlark April 8, 2008
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