1 : somebody who is too shy to dance in public areas, yet has no problem breaking out the moves in his/her bedroom
2 : somebody that learned how to dance by dancing and looking at themselves in the mirror
3 : somebody that surprised their friends with his/her dance moves at the club, because nobody had ever seen them dance before
"damn, where did he learn how to dance like that?"
- ah, he's a closet dancer.
"how did she get so good? where are her moves from?"
- she's been practicing in her room. she's a closet dancer.