A lengthened version of btdubs, which is a legnthened version of btw, meaning "by the way". Btdubstep actually has more characters in it than "by the way" does, if you aren't counting spaces.
Dude you look like a model. That's a good thing, btdubstep.
E-mailurile sunt trimise de la firstname.lastname@example.org. Nu-ți vom trimite mesaje nedorite.