The term REAL JERK can be broken down into four crossword solutions: SPASM (5 letters), ASS (3 letters), SCHMO (5 letters), and SOB (3 letters). SPASM is an involuntary contraction of a muscle or group of muscles, ASS is a donkey or a fool, SCHMO is a slang term for a stupid or foolish person, and SOB is an informal term for someone who is annoying or unpleasant. Together, these words describe someone who is foolish, annoying, and unpleasant.