Pookles -- Speaking of weird, nonsensical sayings, my dad -- who grew up in the 20s and 30s -- had a couple that didn't make sense, but I always liked them and still say them sometimes -- they're supposed to be "rank-outs":

 

So's your old man!

 

Ahhhh, yer mudder's dirty underwear!

 

Hey, yer, mudder wears combat boots!

 

 

(mudder = mother)