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1.
1.
v. getting you dick sucked while doing somthing hella cool like eating a sandwitch or playing video games.
Cupcake resived mega dome from buttercup while playing video games.
by tara June 18, 2006
 
2.
an unusually large head. not common in most areas of the world. Used as a noun or a nickname. e.g. He has a megadome. or Yo, Megadome!
damn, you got that size 8 fitted, you gots a megadome.
yo megadome, get me a drink.
by kurtisjax November 01, 2006