Dead-set turkey
Someone who acts like an idiot for laughs, all of the time, and will most likely never mature, but is otherwise harmless to fellow humans.
Example:
That mate of mine Pete throws his dog's shit straight over the neighbour's fence and into their pool, he's a dead-set turkey, honestly.
That mate of mine Pete throws his dog's shit straight over the neighbour's fence and into their pool, he's a dead-set turkey, honestly.