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1.
The head of a dick..
My gay co-worker Kevin always talks about licking the fireman's helmet.
by Mark August 29, 2004
 
2.
a penis head. It resembles a fireman's helmet when turned to the side.
I showed my friend my fat fireman's helmet! It was bigger than his!
by Joe71444 January 17, 2011
 
3.
a word used by men to describe there cocks
"hello lovely ladies wanna check out my firemans helmet its large and in charge"
"no doosh bag i dont date firemen"
by Ollie Wright,kieron sykes August 18, 2006