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."
Kate: Why do you keep looking at that guy?
Ashley: Oh I can just mantasize us making out!
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