When one hasn't gotten action (hooking up etc.) of any kind for a long period of time. The opposite of a drought would be referred to as "the tropics".
A period of time with no pussy or girlfriend, basically single and horny as fuck. The drought can drive a person insane. symptons of drought are messing with ugly or fat girls.
Oh man, what happen to jerry
Man, he got the drought, shit is killin him
Thank god, i aint him, im gettin some pussy tonite,
me to
(high five)