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1.
the removal of the head which normally consists of some idiot hacking off the head with an axe directed in the neck area.

also it can mean to lose ones limbs. via other methods to so watch out for the axe wielding maniac behind you!!!!!!
death by decapitation.

haha your head fell off

ur wiener has been decapitated

she bit so hard i endured my pecker being decapitated by her crooked snaggly teeth
by neal + kev July 18, 2006
 
2.
The most effective option in the curing and prevention of headaches.
My wife kept complaining about headaches, so she tried decapitation, and she hasn't complained since.
by PhantomHeadPain September 10, 2010