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1.
Reffering to the most horrifying person, possibly in the world - Guy Sebastian.
Made up by Ross Noble on Triple J.
Can be Used as a deregatory comment.
jeez, you must have had a rough night, you look like the bast
by Dave January 05, 2005
47 4
 
2.
a small human like creature with tiny facial features. A nocturnal animal, the bast resembles the appearance of Guy Sebastion, and has been seen outside at night nibbling on wood, whilst planning the destruction of all the souls on earth.
I heard a noise outside, I thought it might have been the bast tunneling through the garden.

You go and spend some time with your Nanna or I'll leave you outside and the bast will get you!
by Leon January 05, 2005
22 2