*random person replying 3 months later*
He's Shizuo Heiwajima from Durarara!!.
That gif is not straight from the anime, it's a pic of Shizuo combined with Izaya Orihara's (another character from the same series who is shipped with Shizuo by the fandom) chair and room so it would look like Shizuo would be doing some suspicious humping on Izaya's chair and quite obviously on Izaya himself, haha...
*random person out*