A mispronounciation of "bregin" originating in Guam in the 1950's by a retard named Froy Layvan (later made famous by being a subject in the experiments of Dr. Frink). Layvan tripped while saying 'bregin' and it came out 'gretchin' and thencefourth said 'gretchin' in it's place. In 1954 he was moved to the US for study where the saying caught on like wildfire.
A niche and unconventional act in which an individual engages in self-pleasure using minced garlic as a tactile or sensory component, typically while consuming or viewing content related to the Shrek franchise, such as movies, spin-offs, or fan-made creations. The term combines the physical act with the thematic connection to Shrek.
"Me and the rest of the boys will be at the Greshing party if you wanna come."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi