Idolator: The Janoskians’ latest single is appropriately titled “This Freakin Song” (or, in its more explicit version, “This Fuckin Song”), and its sing-song melody and “la la la la la la” chorus pretty much ensure that you won’t be forgetting the track anytime soon, which was co-written & co-produced by Mike Posner, Mat “Blackbear” Musto,…