noun. (croo'-tun) Alternate name for Trans-Neptunian objects (TNOs), a planetoid composed of ice and frozen space cement: possibly a corruption of the words "Tons of Crud" combined with assonance on "Pluto". See Pluton definition 2.
Clyde Tombaugh discovered the first of the Crutons at Lowell Observatory in 1930. It was named named Pluto, a planet, though it fell short of being the more massive Planet X he sought.
A person (commonly male) who appears to be normal until you bring them around girls at which point they become super creepy and completely disregard the Bro's before Hoe's rule (ie cockblocker). Usually can be seen in a leather jacket, smoking a cigarette, sporting sideburns, and occasionally wielding an acoustic guitar which they use to sing slow sad songs with. Crutons completely disregard the fact of whether or not a potential hook-up is in a relationship. Crutons are also known to be late periodically and brag often about the "hot" hook-ups they've had.
Where the hell is Cruton? Wait a second...where is my girlfriend?!