Definitions of prim:

• verb:   dress primly
• verb:   assume a prim appearance

  Example: "They mince and prim"

• verb:   contract one's lips

  Example: "She primmed her lips after every bite of food"

• adjective:   exaggeratedly proper
• adjective:   affectedly dainty or refined
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #17602)