Fridge

A Fridge is a large, tall Quidditch player (usually, although not always, a Keeper) who acts both as an impenetrable brick wall and a giant freight train.

A Fridge may often be seen steamrolling the Quaffle down the pitch with tiny squirming Chasers dangling ineffectually from his/her limbs.

Coaches have been known to weep tears of happiness upon acquisition of a Fridge. Off the pitch, Fridges are giant teddy bears that also serve as cuddly full-body pillows for long bus rides to and from tournaments.

Exhibit A - Colin from uOttawa: