Sorry, I've been on reddit...and found the eighth definition here:
回す まわす 1: to turn; to rotate; to gyrate; 2: to circulate; to send around; 3: to surround; 4: to put something to a new use (e.g. leftovers); 5: () (after the -masu stem of a verb) ... around (i.e. to chase someone around); 6: to dial (e.g. telephone number); 7: (Godan verb with su ending) to invest; 8: to gang-rape
Is this definition ever used? Is it slang? If it is not asking too much, would someone provide an example?