Abbreviated from "Well-deserved-boner," a WDB is the inverse of a no reason boner (or NRB.) It is an erection induced by a sexually exciting occurrence and/or something excessively masculine (often warranting a broner.) It has a definite motive and it stands tall with pride.
A: Dude, I tots just got a major NRB from Babe McTittypants over there.
B: That's no NRB, you have a WDB on account of her remarkably toned body and astonishing rack.
one direction's best song, it’s the combination of pop and rock and the lyrics that may we all agree it’s one of their best songs and proves one direction it’s not just another bubble-gum pop boy band