Combination of the term bitch, which means someone who complains, yells, and is always in a bad mood, and retard, which means someone who consistently does incredibly stupid things.
Definition: A whiny and bitchy person who is constantly acting like a retard.
A word that mixes the words: bitch and retard becoming: bitchtard.
A very stupid woman; someone who is a slut and a hoe. Usally refers to woman who makes a big sexual or flirty mistake. She steals a guy or cheats. Or it could just be a douchebag way of a describing an air head.