a donny

Praise which has no value/of less value than had it come from a more esteemed person.
I.e. when Donny Osmond gave out the first ten of Strictly Come Dancing 2014 as a guest judge, it wasn't the same as receiving the first ten of the series from one of the permanent judges.

I really hope Sir Alex picks me to play for Manchester United. My uncle said he'd put me in the team, but that's a bit of a donny.

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