My thing is used as a title to describe someone you’re in a “thing” with. Your thing is someone you love unconditionally, your best friend and your soulmate. The conventional scary labels of society have swayed you away from the terms “boyfriend” and “girlfriend”, but your love for your thing means you insist on some form of commitment. You could never let them slide away that easily, they mean too much, so you tie yourself together with the title of a thing. Thus, them becoming your thing. Having someone as your thing can sometimes mean more than a relationship, you’re not worried and caught up about the intricacies, you are their thing, they are your thing and that’s all that matters.

What a pervert says when he gets to a point in a conversation where he thinks what he is about to describe is too much for his audience to handle.

Based off Kid Cudi song, I do my thing. "I smoke I drink I do my thing. I'm livin' in my own world"

It also means spread peace and love.

It means doing whatever you feel like doing that interests you. It may be trying many things to figure it out.

what teenage girls say when their parents say "no" to something they really wanted to do.

Possibly the best non-joke pickup line of all time

My little thing defines someone special and petite. You can use it for your gf, lover, spouse or child.

In this sentence, "a thing" does not mean an object.