A skankbag is any person who is being particularly annoying to you at that moment in time. The person being annoyed has the right to call said annoying person a skankbag at any given point in the time of their annoying-ness.
Kaycee: Do you remember that dress you tried on at the store that didn't fit that you really liked?
Taylor: Yes.
Kaycee: Well, I bought it for me and it looks great!
Taylor: You're a skankbag!!!
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