Back in my day, our insults actually made sense.
We didn't say, "You're lame" or "You suck" like you kids do these days.
Here are some insults that we used:
-"Thou thou mammering hedge-born gudgeons!"
-"Thou unmuzzled reeling-ripe dewberry!"
-"Thou clouted hag-born barnacle!"
-"Thou fobbing dread-bolted tyrant!"
-"Thou yeasty dismal-dreaming incontinent varlet!"
-"Thou fawning tallow-faced tyrant!"
-"Thou goatish idle-headed eternal devil!"
Shakespearean Insult Generator:
http://www.william-shakespeare.org.uk/a2-shakespeare-insult-generator.htm
Have fun!