Prem is a term derived from 'premature', meaning undeveloped. It is used to describe teenage boys that have not yet hit puberty, i.e they are short and beardless with an unbroken voice, this deems them unattractive. 'Prem' can also be used to describe short girls with no boobs, although it is less common being used in this form.
by Cows August 24, 2006