Your friend's poetry is terrible,"he said.Clary blinked, caught momentarily off guard. "What?""I said his poetry was terrible. It sounds like he ate a dictionary and started vomiting up words at random.

”

This quote suggests that your friend’s poetry is very bad. It is as if he has used a lot of difficult and complicated words all at random, as though he had eaten a dictionary and was vomitting the words out. Clary, who heard this, is taken aback and responds to the statement with confusion, asking “what?”