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1.
The perfectly egg shaped head of a human. Especially when shaven.

A person who is named John.
"Hey Eggbag, nice head."
by johnnygun August 21, 2009
 
2.
An eggbag is the silhouette of one of your testicals with the bag stretched taut so that it gives the testicle that egg like appearance... Must have a brazillian wax or something close.
Kent's eggbag looked so enticing to her, with just one ray of moonlight hitting it at just the right angle.
by Tribaltattoo December 26, 2008