A portmanteu of man and maintenance. Usually refers to the unspoken maintenance tasks some men perform or actions taken by a woman to keep her boyfriend.
Man I feel great after some mantenance today, shaved some body hair.
She has totally been slacking on her mantenance sex I am so gonna break up with her.
Any form of male grooming.
"Yo dude, I gotta run. Gonna do some mantenance. Gotta be tough on the scruff!"
1) A necessary, completely spontaneous, and very short masturbation session required to maintain mental stability.
2) The antidote for the random public boner.
Ben excused himself politely from Christmas dinner with the in-laws, to perform some much needed mantenance.
Chris acted like he was peeing, when in fact he was performing some mantenance, from an unexpected boner at the ballet.