Subtle, acute, quick-witted; also a sharper or cheat, in opposition to a flat, dupe, or gull. Sharp's the word and quick's the motion with him; said of any one very attentive to his own interest, and apt to take all advantages. Sharp set; hungry.
SHARP
Meaning of SHARP in English
Slang English vocab. Английский сленговый словарь. 2012