adj. used to describe a very loose woman, i.e., one who has been the recipient of much porkage.
"dude, mandi is like a fucking glass of water."
"that doesn't make any sense."
"no, i mean fucking her is like sticking your dick into a glass of water."
"oh, i see. yes, she is quite the whore. and i think i'll pass on that drink."
A seemingly attractive female whom many men have fallen for initially, only for them to notice her dull personality.
You could send the funniest joke to this girl and the best reply you'd get would be 'lol' or 'lmao'. Often there's a chance for her to not respond at all.
Anyone dating the Glass Of Water Girl will grow up to become a middle-aged white man in a childhood sweetheart marriage that neither spouse is interested in anymore.
Eugene: Ugghh I sent this hilarious meme to jacky and all I got as a reply was ''Lmao'', I tried to continue the conversation and she just left me on read.
Donald: Hey man, she's not worth it, she's just a goddamn Glass Of Water Girl.