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29.
a flat-chested woman
- That chick is a real knockout!
- Too bad she didn't grow any knockers...
- Yeah, she's a plank.
by plankspanker February 25, 2009
 
1.
A dumb person..a piece of wood
You stupid plank, You lost my plank!
by Kurt NG UD September 19, 2004
 
2.
There are three types of planks:

A plank of wood
Jonny 2x4's best buddy (From Ed, Edd and Eddy)
or a realy dumb fuck

Choose wisely
Where's my bloody plank?
Don't say anything plank!
What a complete and utter plank!
by Diccyc April 02, 2005
 
3.
An extremely painful excersice in which one puts their elbows and toes on the ground and straightens their backs. aka Bows and Toes.
PLANK. up for 60 seconds, down for 10
by Nothereman May 21, 2006
 
4.
A stupid or silly person. Having a similar mental capacity to a piece of wood.
George is as thick as a plank.
by Thee Red Monkey June 01, 2006
 
5.
Posting up on a object while lying completely flat (like a plank of wood).
Dude, you won't plank that police car!
by Planking Professional July 09, 2011
 
6.
The prescription drug Xanax
Hey you wanna buy some planks?.. 3 for 10?
by nemizis November 01, 2007
 
7.
The clever combination of the words Please and Thanks. Often used after the realisation that you forgot to say please in the first place. Planks has nothing to do with planking.
"Hey mate, pass me the bong"
(Mate passes bong)
"Planks mate"
by V man #1 May 30, 2013