It doesn't mean anything why did you search this?
This is so, wait , fortgab what is that?
a bad meme from 2016.
to "dab" you must put one or two arms in front of your face pointing one direction.
if you still don't get it just google it.
"dude the whole world saw me dab on camera! no one likes me anymore! i'm talking to a pillow."
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