Hein is an abbreviated version of the word
Heinous.
Heinous meaning: (of a person or wrongful act, especially a crime) utterly odious or wicked. Hein
may be used as both an adjective, verb, and noun.
Adjective: Her
box is absolutely hein, lot of labia hang.
Verb: I think we should hein around the city tonight.
Noun: Wow, that chick gives me the hein(
s). She won’t
stop trying to bang that homeless man.