what does hicks mean when he says,'mah britches is just as long as his?

Hicks has great confidence in his ability to talk to women and convince them to fall for him. He sees language as a manipulative key to getting women. According to Hicks, getting women isn’t the actual content of the language. So he’s consciously manipulative and belittling with his language, assuming that women don’t understand his clever use of words and stupidly fall for a man because he uses impressive language.