Ask for me tomorrow and you will find me a grave man: This means that he will be dead and sad

A plague aboth your house; This means hes cursing the Capulet and montague.

They have made worms meat of me : this means that worms can eat him up in the grave.
O sweet Juliet Thy beauty hath made me effeminate and in my temper softened valours steel: this means that juliet made him soft but when he got angry he ended up killing sombody.