MERCUTIO: Oh ho! Listen to how broadly he stretches that joke!
ROMEO: I was waiting for the word "broad”...
...Add that to "goose" and it just goes to show: you're a broad goose!*
MERCUTIO: Ha! See, isn't all this joking better than groaning about love? Now you're yourself, now you're Romeo.
Now you are what you truly are. This driveling "love" of yours was like a blithering idiot, running up and down looking for a hole to hide his toy* in.
BENVOLIO: Stop! Stop there.
MERCUTIO: You want me to stop my tale before I'm done?
BENVOLIO: Yes! Otherwise your "tale" would grow too long!
MERCUTIO: Oh, but then it would have gotten short again because, once I'd gone deep into my tale, I wouldn't stick around!
*You'll just have to trust them that this is hilarious.
*A string of dirty jokes follows, punning on tale and tail (i.e. the male genitals)