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All Head, No Shaftsex (-0.259)
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."
by Tabooky February 03, 2009
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