A 17-year-old boy was busted in the deadly stabbing of a 39-year-old man just off Times Square — and disturbingly told police that he did it as part of a “mess with crackheads” TikTok trend, cops and law enforcement sources said. The alleged stabber — identified by sources as Jayden Sanchez — was picked up around 8 p.m. Wednesday and also faces a weapon possession rap in the Monday night knifing of Leonides Baez, 39, police said.