Oh and a 'vingelpitt' is someone who can't make up his mind, or just something or someone that wobbles a lot. Vingel + pitt

Quite a bit of slang. Where is this from? Are these sentences related to each other? Anyway, I'll give it a shot!

För att impa (imponera) på polarna

To (in order to) impress your pals 

och du drar hem nån trebarnsmorsa 

Probably a retort, making fun of someone because he picked up and brought home some older woman looks like she may well be a mother of three children.

Vi hämtar lite damer, tassar iväg 

Again, probably saying something like bringing over chicks and then slinking away. Att tassa is a verb comes from tass which means paw. Has a lot of meanings

Tjena, tjejer! Benka sa att ni ska lasta av grejerna på kajplats

Benka has told the speaker that the girls are going/are to unload the stuff at the docks

parbrud. Fyller ingen funktion

No idea what this could possibly mean, maybe with context...