Definition of preps:
(n) :
(informal, countable) A prep school.
(n) :
(informal, countable) A student or graduate of a prep school, a preppy.
(n) :
(US, slang, chiefly derogatory) A person using the styles and mannerisms (especially in terms of fashion) associated with prep students.
(n) :
(countable) Preparation.
(v) :
(informal) To prepare.
(n) :
(horse racing) A preparatory race or workout.