A phrase used by men to their own sex to tell them to stop complaining/whining. Comes from the original word "tampon" which is used only for women (in most cases).
Man #1: This sucks, why do we have to keep doing this?
Man #2: Why don't you get a manpon and suck it up?
The plural form of penises.
Man #1 - There were so many penii in the shower
Man #2 - Duh, it's a guys locker room, you idiot.