Top the previous poster's over-the-top insult.

When you show you best side, all you see is shingles.

You have such a dearth of wit, you would rather see this thread die than to put forth a single calorie of effort.

I see you’ve joined this battle of wit, unarmed!

You had a thought? Poor little thing. I bet it’s lonely.

I’ve got a joke that will make you look stupid. Oh. I see you’ve already heard it.

When you die, I hope the only one they’ll find to give your eulogy and comfort your survivors will be your worst enemy. As your enemy, I expect that he’ll do everything honorably and well.

You look like you fell out of the Ugly tree and hit every branch on the way down.

Your mother was a wombat and your father smelled of durian!

Your grandmother swims after troopships.

You’re not the dumbest person on earth, until he dies.

If ignorance were cornf… oh, never mind.

(Next!)

I hear you refill cream donuts.

(Points with open hand toward Elendil’s Heir) The Aristrocrats!

(Link is Gilbert Gottfried. If it’s SFW, then I want your job.)

Yo momma so big she got her own Zip Code.

Your momma’s so dumb she went to Hungary to lose weight.

Yo momma so fat when she sits around the house, she sits AROUND the house.

Your dick is shorter than the line to the ladies room at a Rush concert!

Looks like you were last in line when they were handing out brains.

I hear Bill Cosby spiked your drink to get away

I heard you tipped Bill Cosby when you were finished.