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1.
A cross between a ghost and a goat
Look at that goast! It sure is scary and hairy...
by Goast February 23, 2003
 
2.
Goast is the Platinum Claw Family Handle
it stands for Greatest Of All S. T. The S. T. stands for different things depending on what you are doing.
This ain't no ordinary smoke. This is da goast. (Greatest of all smoke things).

That niggas voice is the bomb. He is the goast. (Greatest of ALL Singing Things)

That pussy is the goast. (greatest of all sexual things.)
by Lil Reazon Goast October 27, 2003
 
3.
to use sexual intercourse as a means of reviving the deceased.
Upon discovering his girlfriend's fresh corpse, Johnny knew that he must goast her if he ever wanted to speak to her again.

Despite common misconceptions, people trained to goast are not necessarily necrophiliacs, but simply consider it a reasonable means of aiding in reanimation.
by ThePowerOfHAT September 18, 2006