bute
n.— «The biggest problem confronting the industry is its addiction to performance-enhancing drugs. In the early 1960s, phenylbutazone—bute in racetrack parlance—seemed like a miraculous antidote to lameness in tired horses.» —“View From The Rail: Horse racing out of control” by Larry Lee Palmer Seattle Post-Intelligencer (Washington) June 23, 2008. (source: Double-Tongued Dictionary)
Further reading
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The expression to go chalk has to do with rankings in an athletic tournament and harks back to when seeded teams or players were listed on a chalkboard. To pick chalk means to choose one’s favorite competitor, and you can also speak of a chalk...