Wiktionary
pull a face
vb. (context idiomatic English) To make an abnormal facial expression, either intentionally of because of an emotion.
WordNet
pull a face
v. contort the face to indicate a certain mental or emotional state; "He grimaced when he saw the amount of homework he had to do" [syn: grimace, make a face]
Usage examples of "pull a face".
I guess you just pull a face and point at the tooth that hurts and the guy'll draw it for you.