GD rhymes with a lot of different things, which one is most fitting?
BD - short for BDSM, stands for bondage and discipline (sometimes domination)\
CD - compact disc
DD - large breast size
ED - erectile dysfunction
PD - element 46, Palladium
TD - toronto dominion bank
VD - venereal disease
ZD - a 3-liter, 4 cylinder diesel engine manufactured by Nissan