To laugh so hard that you pee your pants; a combination of laughing and wizzing. Used in an episode of 30 Rock.

A combination of laughing ang whizzing according to one Elizabeth Lemon of 30 Rockefeller

v. laughing + whizzing = lizzing.

Whizzing (peeing) and laughing at the same time. Laughing so hard you pee yourself.

Lizz is the bestest friend anyone could ask for. A little weird at times but in a good way. She is always there for those she cares about, and is great fun to be around. She is beautiful inside and out, and is extremely smart. She's a lovely person, never let her go.

A sweet girl that can't understand how amazing she is. So nice and giving, too good for anyone to deserve. She is smart, funny, beautiful, and a very awkward turtle. She has a passion for movies and music. She is the most interesting little lady that you will ever have the pleasure of meeting.

Lizzing is a combination of laughing and whizzing, it happens when you're laughing so hard you start whizzing a little too.