To spell one's name in ejaculate on the chest of one's partner. Bonus points are earned if a stamp is wiped on the penis and then affixed to the partner's forehead.

Related definitions: Mexican Return Address
It cost me 37 cents, but it was definitely worth it to give her a Mexican Postmark.
by Soda November 11, 2004
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Bush sends national guard to postmark mexicans as guest workers!
LA dudes, check it out! red, white, green, bar code on my ass!

Wow Mexican Postmark I know gringos have mexican love.

Muchas gusto National border patrol man. Viva El presidente GWB!
by itichie_nocanpo July 3, 2006
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