skinny dip noun 1verb 1forms 4 noun1 •The act of swimming naked.On the last night of camp, it was tradition for the girls' cabin to sneak down to the lake for a midnight skinny dip. verb1 •To swim naked.Wanting to cool off after a long hike, the women decided to stop and skinny dip under the waterfall. formsskinny dipped · skinny dipping · skinny dips · skinny-dips