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The act of (typically a man) fantasizing about another man, whether sexual or otherwise. Often the result of a Bromance or Mancrush
"Wow bro, I was totally Mantasizing about you last night dude."
"uhh...nahh..."

"Go Mantasize about him. You guys are friends, and he'll probably like it."
by TheObsticle December 07, 2009
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