The guy behind the viral 'Crazy' trend on TikTok is reaping a ton of benefits after setting the internet on fire with the latest frenzy -- and he's already got a gig out of it ... with the WNBA. We talked to Stephen Glickman -- who's already famous from the "Big Time Rush" show -- on "The TMZ Podcast," where he discussed his now-viral TikTok sound ... in which he does a slow, dramatic rendition of Gnarls Barkley's 2006 hit, "Crazy." Tons of stars have hopped on the trend -- lip-syncing to his track and sharing something cringe-worthy from their past.