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1.
A term used by Captian Murphy of sealab, usually describing Marco
I hate Marco, I hate Marco, I hate Marco, and his mailbox head!
by Leenikins August 01, 2004
 
2.
A reference towards jocks and their overly boxy head.
Wow that dude has no neck and a serious mailbox head.
by DMAK November 20, 2007