What is All Head, No Shaft?
1.
Analogous to "All Bark, No Bite". A person who is a loud, obnoxious, overly aggressive jackass, but without anything to back up the behavior. It's is like having a thick two-inch dick with a huge head, impressive to the owner but basically useless.
"Look at this feeble dork acting hard and trying to boss everyone around;
He's All Head, No Shaft."
See 
Random Words:
1. 
noun.- A loser IRC user known as Tim_
2. 
a person with a large gut, pear shaped body, who is ignorant and clumsy.
Some fat guy wearin.. 
1. 
A coat that has had numerous knobs wiped on it after sex.
or
A white crispy coating on a posh bird's curtains
"I'm jus..