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?!