Someone who would say anything to get a highest-rated comment on a YouTube video. Most of the time the comment has nothing to do with the video or at times the person would post a paragraph-long comment just so their comment can be noticed. A thumb whore would use certain techniques to get people's attention like abuse the caps lock button.
Thumb whore- "The quality of this video sucks! Stop recording shit with a cellphone and get a real camera! Thumbs up if you agree!!!"
Thumb whore- "THIS SONG ROCKS!!! THUMBS UP IF YOU AGREE!!"