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1.
A word made by me that you use as in insult or just for the hell of it.
Haha its mister jizzamagoo

Hey whats up? Jizzamagoo!!!
by Matt M November 22, 2003
 
2.
a word made up by 73# |_|1332 1337. aka matt. an insult, also meaning "loser, yugioh nerd, or buttplug"
look at that loser, i think his name is dan. what a jizzamagoo.
by louizzle January 25, 2004