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
Where's my bloody plank?
Don't say anything plank!
What a complete and utter plank!
A dumb person..a piece of wood
You stupid plank, You lost my plank!
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
A stupid or silly person. Having a similar mental capacity to a piece of wood.
George is as thick as a plank.
Posting up on a object while lying completely flat (like a plank of wood).
Dude, you won't plank that police car!
The prescription drug Xanax
Hey you wanna buy some planks?.. 3 for 10?
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)