A crouton is a vile and agressive action. Meant as an insult or challenge, an attacker removes of of his victims incisors, seasons it, and replaces it in the mouth of his victim. This will usually frustrate the victim to a high degree.
While travelling to Florida, Dave met a punk on the airplane and was forced to crouton the poor guy.
A crouton was a racist term which applied to Caucasian race. This term originated in the 1960's civil rights movement mostly as a slur used by the black population. The term referred to higher class white people who could afford to put crouton's in their salads as a status of their wealth. In rebellion, the black population labeled these spoiled upper-class white people as 'croutons'. The term may also refer to the status of Caucasians as the "top-of-society" even though they were merely cheap, vapid "re-baked pieces of bread". This term may be in reference to the phenomena of cheap croutons floating to the top of a delicious soup.
Fuck off you crouton go back and float in your soup!