The term is usually referring to a stolen car but, in some cases the car belongs to a baser who gave it up for some drugs.

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.

The noise that something squashy makes when it hits a hard surface. In UK comics, when this happens, you will usually see the word in capitals coming out of the interaction between hard surface and the squashy material. Excellent example of onomatopoeia.
Suitable materials for making the SPALT sound are things like tomatoes, mashed potato, custard pies and squelchy mud.
Look in UK comics like the Beano and Dandy for examples.

when one falls and lands alone- usually on pavement or concrete.

when a guy ejaculates onto someone or something...

The act of moving to the ground with the legs fully apart while keeping the torso erect, when done by a fat woman. Basically, the splits done by a fat chick.

an asterisk. Used by UK computer people. Because it looks like something squashy, like mashed potato, that has hit a wall in a comic (like the Beano) accompanied by the word SPLAT!