http://www.lyricsfreak.com/i/isley+brothers/its+your+thing_20331738.html The Isley Brothers sang the song. Your thing is what you like to do, what you're good at doing, what you have a natural affinity for and some talent at doing. And something that ain't yo thing baby, well, that means you are not interested in it and you don't know about it and you don't enjoy doing it. Robbing banks is not my thing. My Skype: brian.madden4

"It's not my thing" means its not something you enjoy.