Friends Season 1 Episode 20 What does Chandler mean by this terrier? No, I left a message spontaneously last time. ......

In fact, Chandler is laughing at himself, laughing that he is not good at coming up with a particularly cool answer at once (that is, he has no quick wit) or is not good at hooking up with his sister hhh.

Chandler tried to leave a casual and cool message for the last time, and finally he said yes, it was-IO (at that time, people would think lame was particularly old and brainless, agreeing with others' answers).