grabass /ˈɡɹæbˌæs/noun 2verb 1forms 3 noun2 •(informal) Sexual groping; erotic horseplay.[T]hey wouldn't do any work then, just hang around and drink and play grabass with her and she didn't want that. — 1976 •(informal) Rowdy behavior; general horseplay or foolery. verb1 •(informal) To fool around.The Paranoids were singing, to the tune of ‘Adeste Fideles’: […] grabassing around, trying to push each other over the side. — 1966 formsgrabassed · grabassing · grabasses