An attractiveunderage male. Similar to the female version, only not female. For similarities, see "Jailbait" or any of its other forms, but replace female with male, girl with boy/guy, chick with dude, her with him/he, etc.
Cougar-ette (Female in 20s) #1: Oh, wow! That guy is so hot. I want him.
Cougar-ette #2: Oh no way girl! He looks like he's 15 - that's totes malebait!
Mateibait (noun): A special kind of ragebait that only Matei can pull off — not out of skill, but sheer, unfilteredstupidity. It’s when he says or does something so mind-numbingly dumb that people get mad, but he’s completely oblivious that he caused it.