The ridiculous expression on one's face after consuming copious amounts of alcohol and/or drugs (namely cocaine). Another variation is "the face of guy." Also used to describe someone who has spent the night at a "face party"
Dude: Did you see Toby last night? He was so fucked up! He had his guyface on fo' sheezy.
Guy: I was rockin' out at Dude's face party last night, and I left with the face of guy.
Gayface is the look that gay men have that enables other gay men to quickly identify them as "family" no matter what they're doing, wearing or saying. Gayface is identifiable in photos. Gayface cannot be hidden by attempts to butch it up. Straight men with gayface are not really straight.
When I saw his picture in the paper, I immediately knew that girl on his arm was a beard because he totally has gayface.
a straight (or evensometimes actually gay) person who has a face that would make you think that the person is a homosexual. Perez Hilton has used this term to describe Zac Effron's face.
"Did you see those dimples on Mario Lopez? He has such a gayface!"