interplanetary mission, n. — Green’s Dictionary of Slang

interplanetary mission n.

[the ‘mission’ is to get high adj.¹ (3), term from Star Trek]

(drugs) of a user, going around from one crack house under crack n.⁷ to another in the hope of getting some drugs.

1992		T. Williams Crackhouse 149: interplanetary mission travel from one crackhouse to another in search of crack-cocaine or freebase.
2001		ONDCP Street Terms 12: Interplanetary mission — Travel from one crackhouse to another to search for crack.