Looks like it's a kind of pun, or rather, .
The slang word usually means as the Wikipedia article says, but in this video, this title actually means something like . ( is a slangy kanji replacement of used among some net users.) means "real", "serious". Everyone will understand what actually means in this video only after clicking the title and see him jumping in front of a train.
(Or maybe this was intended to be a camouflage; a title like would have been immediately blocked, but would look like just another joke video.)