Wiktionary
n. (context British English) An act of removal of the trousers (of). vb. (context British English) (present participle of debag English)
Wikipedia
Debagging, also known as depantsing and just known as pantsing in the United States, is the pulling down of a person's trousers or underwear mostly against their wishes, typically as a practical joke, but in other instances as a (somewhat common) sexual fetish. The most common method is to sneak up behind the intended victim, grab the trousers at the waist, and apply a quick downward tug before the victim is aware of the assailant's presence.
Pantsing is a common prank in school gym classes as a form of bullying. Its most extreme form includes running the trousers up the school flagpole. Some U.S. colleges before World War II were the scenes of large-scale "depantsing" scraps between freshman and sophomore males, often involving more than 2,000 participants. It is also an initiation rite in fraternities and seminaries. It was cited in 1971 by Gail Sheehy as a form of sexual assault against grade school girls, which did not commonly get reported, although it might include improper touching and indecent exposure by the perpetrators. The United States legal system has prosecuted it as a form of sexual harassment of children.
Usage examples of "debagging".
By the way, Pomfret, have you been approached about debagging Culpepper?
Oh men, oh trousers, what they cover, what they hide, the tanned rump, the bush torched off behind the black bikesheds, the braggings and debaggings, the billion bullybags .