TIFU by calling a customer ugly

i work part time at a small pizza shop in the neighboring township and where it's located, there's a big community of deaf/hard of hearing people. i learned ASL in high school and forgot most of it. i can still sign quite a bit, but i'm not as proficient as i used to be.

one of our regulars fell into a routine with me where i would try my hand (lol) at an actual conversation in ASL, and for the most part it's going very well. if i don't know a sign, i'll finger spell (though not as fast as i would like) and he'll teach me the sign for it. well, we fell into the routine today and it's raining, so i was able to actually have a longer conversation due to the lack of customers. i learned quite a bit, including the word for sausage (which the pizza maker got a kick out of).

some time passes and i see that he finishes his meal and i decided that before he left, i wanted to tell him to stay dry. unfortunately, i mixed up the sign for dry and instead signed something else.

he (rightfully so) was taken aback and i stood there confused because i'm pretty sure what i signed was right. i hurriedly finger spelled what i meant to sign before he began to laugh at me. again, i'm very confused and it wasn't until he grabbed a napkin to write out what i had said.

instead of telling him to stay dry, i told him to stay ugly.

he walked away laughing while i stood there embarrassed and mortified. i would also like to mention that he's a teacher at the local deaf/HOH school, so i'm pretty sure he told everyone what had transpired.

tl;dr i mixed the sign for dry with ugly and ended up signing "stay ugly" to our deaf regular