WordNet sense 1 (an ignorant or foolish person):

booby, dumbbell, dummy, pinhead

WordNet sense 2 (carbonated drink flavored with extract from Kola nuts (`dope' is a southernism in the United States)):

cola

WordNet sense 3 (slang terms for inside information):

poop, low-down, the skinny

WordNet sense 4 (street names for marijuana):

gage, grass, locoweed, pot, skunk, smoke, sens, sess, green goddess, Mary Jane

WordNet sense 5 (give a narcotic to):

dope up