When the condensation from your pint glass causes the coaster to stick to the bottom when you pick it up, making it look like the Mad Hatter's hat.

getting high off marijuana with a close fraternity of friends

a rising term used by queefloads who think it's cool as fuck to refer to someone as this because it's straight outta alice and wonderld when relaly it's only cool because of mad hatters, the beer. and no other reasons. unless you watch the x-files.