Definition of prims:
(adj) :
Of a person, their manner or appearance: Formal and precise; stiffly decorous.
(adj) :
(by extension) Of a person: Prudish; straight-laced.
(adj) :
Of things: Neat; trim.
(v) :
(transitive) To dress (one) up affectedly or demurely. [with up or out]
(v) :
(transitive) To give a prim or demure expression to (one's face, mouth, or (rare) lips).
(v) :
(intransitive) To make one's expression prim. [with up]