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the opposite of buoyant.
Meghan can hold very long under water tea parties because she's just so girlant.
by becca w August 20, 2005
A measure of fuckability based on the weight of a female. It is defined by the ratio of "would have sex wtih" to the "effectiveness at which her boobs are able to cover a man's penis".

Girlant=(sexability)/(tit fuckability)

May also be used as a measure of a male's intoxication level.
Jenny's much more girlant now the she is snorting cocaine. It's too bad her titties are too small to fuck.
by 4chan4life April 27, 2010