bontan pants hunt; robbing students of their bontan pants
Slang term from high school manga, referring to the act of hunting down students to steal their puffy bontan (harem) pants. The term is culturally specific and not used in everyday conversation.
See also: ボンタン
In that manga, there is a scene where a delinquent group is doing a bontan pants hunt.
Compound of ボンタン (bontan, a type of puffy pants) and 狩り (hunt). The exact origin of ボンタン is uncertain, but it is associated with a specific style of loose-fitting trousers popular among certain youth subcultures.