WordNet (r) 3.0 (2006):

locoweed
    n 1: any of several leguminous plants of western North America
         causing locoism in livestock [syn: locoweed, crazyweed,
         crazy weed]
    2: street names for marijuana [syn: pot, grass, green
       goddess, dope, weed, gage, sess, sens, smoke,
       skunk, locoweed, Mary Jane]