To freebase cocaine.
Made famous during the legendary "Sister Christian" drug den scene in the movie "Boogie Nights."
Alfred Molina gives one of the best performances of his career as doped up drug dealer/party animal, Rahad Jackson.
Rahad Jackson: "You guys want to play baseball?" (As he's freebasing some cocaine by the bar)
Dirk Diggler: "No" (looking nervous)
Reed Rothchild: "No thank you" (looking nervous)