"Te mordiste la lengua guey"?
What does it mean? Said in response to a joke I think
3 Answers
In México you uses "¿te mordiste la lengua?" (always as a question) when someone has a bad opinion or criticism about a person, topic or ideology etc.
But that person has the same bad qualities that is criticizing.
Example 1:
Chica A: Rebeca es muy hipócrita y mentirosa, ayer la ví en el cine con un hombre que no era su novio.
Girl A: Rebeca is so hypocrite and a liar. Yesterday I saw her at the movie theater with a man that it isn't her boyfriend.
Chica B: ¿No te mordiste la lengua querida? Yo te ví el último fin de semana en la ciudad vecina, estabas caminando de la mano con un hombre que no es tu esposo.
Girl B: Didn't you bit your tongue darling? I saw you last weekend in the neighboring city, you were walking, taken by the hands with another man that isn't your husband.
Example 2:
Hombre1: Sólo nosotros dos veremos el juego, Carlos está enfermo y está en el hospital, es muy descuidado no cuida su peso ni lleva una dieta sana por eso se enfermó de Ateroesclerosis. Es lo que te merces cuando no cuidas tu salud.
Man1: Only we both will watch the game. Carlos is sick and he is at the hospital. He is very neglected, he does not care his weight and never follow a healty diet, for that reason he get Atherosclerosis. It is that you deserve when you dont care for your health.
Hombre2: ¿No te mordiste la lengua güey/wey? Tu acabas de ordenar 2 pizas para comer mientras vemos el juego y además 12 piezas de pollo frito y cerveza.
Man2: Didn't you bit your tongue dude? You have just ordered 2 pizzas to eat while we watching the game and also 12 pieces of fried chicken and beer.
Conclusion:
¿Te mordiste la lengua? is a sarcastic way to say "dont be an hypocrite"
Maybe it's literal, lol. You bit your tongue? Bet that hurts.
I think it's somewhat like "You bit your tongue, dude." Maybe it means that they killed the joke or ruined it. haha I'd love to see what other people say. 
~Tortox
