Dump and go

A man or woman who isn't worth any value and is easily used by someone

Also a person who is known to be fucked once then dumped

Sloppy unethical person

Lousy and lazy
Not worth a flip and not worth the sperm they were made from

Dump: meaning to toss or disgard

Boy: That girl is a dump and go meaning only used for a one-time fuck and dump after