someone who says they're really straight (them being in the closet) but in reality, they're gayer than all rainbows combined, but they don't wanna admit it (hence the term crystal closet, because everyone except them can see through their closeted behavior. the trans equivalent for this would be "egg".)
x: have you seen z? they're so gay it's turning me homophobic, like come out already!
y: typical crystal closet behavior, they'll grow out of it (i hope)
z: IM NOT GAY ISTG
Someone who is uncomfortable with abnormality. Someone who does not embrace eccentricities. Someone who does not have a decent sense of humor. Someone who is naive. Someone who lacks general intelligence.