A song in a musical in which the singers are all male and the song is of a high manful quality; usually involves singing about objectifying women and/or fighting.
Feeling fantastic after the successful completion of a particularly machofeat.
Following his fifth keg of beer, Kevin ripped the horn off of his pet narwhal, and then nailed his porn-star girlfriend for hours. Subsequently, he felt mantastic.
“Michael, did you see that flyer for a lost pet?”
“Yea, I saw it Allison, I can't stop thinking about how funny it would be to arrive at the pet owner’s home, tell them you found their pet, and then when you see the look of relief in their face, hand them a bucket of coyote shit mixed with fur.”
“Michael, you’re so Meantastic”