This refers to the process where a DJ is building up to 'Dropping the Bass' in their mix while performing at a nightclub, but then doesn't follow through, and leaves the entire dance floor feeling thoroughly unhappy and unsatisfied.
Guy: "Oh, here it comes! He's about to drop the ....Eeargh! No! that DJ just gave me Nightclub Blue Balls !...My night is ruined"
by Krabooji September 25, 2012
Get the Nightclub Blue Ballsmug.