Random insults from the 1920's:
"You're all wet!"
"oh, that's baloney!" (my grandfather said this a lot and some people still do...)
"Beat it, kid." (get outta here; go away)
Bluenose (a prude)
flat tire (being lame, in a romantic sense)
"I'm gonna punch you right in the kisser!" (punching someone in the face...in the 50's, people would call people's faces their "puss" in a similar manner, no joke)
*ragamuffin is my absolute favorite