n. 25B6; verb Cullam cuffed him on the head : HIT, strike, slap, smack, thump, beat, punch; informal clout, wallop, belt, whack, thwack, bash, clobber, bop, biff, sock; Brit. informal slosh; N. Amer. informal boff, slug; archaic smite.
25A0; off the cuff (informal)
an off-the-cuff remark : IMPROMPTU, extempore, ad lib; unrehearsed, unscripted, unprepared, improvised, spontaneous, unplanned.
I spoke off the cuff : WITHOUT PREPARATION, without rehearsal, impromptu, ad lib; informal off the top of one's head.