Sentence:  “Yay! I know you! You're Nicholas Lee, the detective who got fired 'cos of us!” Nina exclaimed happily. Lee <WSD>facepalm</WSD>ed. “Arrgh...” “Nina...” Tris muttered. “Let's quit while we're ahead, okay?” 
Meaning of the word marked with <WSD> tags:  To bring the palm of one's hand to one's face as an expression of mixed humor and disbelief, disgust or shame; for example, when one is caught off-guard with a particularly bad pun.