Top Definition
The ship between Sam Winchester and Castiel of the CW show Supernatural. It is a name made up to refer to their "couple name", combining both Sam and Castiel. The shorter term and the one that is usually said is just "Sassy".
Fangirl: did you see last night's episode? There was a shot of Sam, following a shot of Castiel! Could the writers be sending a bigger hint! They are so totally canon *starts reading disgusting fanfiction*
Normal Supernatural fan: What the sweet peanut-butter and jelly Jesus? sastiel is completely materialized from the minds of some crazed/bored fans.
by Supernatural Fan January 24, 2014

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