"My neighbor was such a schmegegge."

"I think of a shmegegge as a cross between a shlimazl and a shlemiel—or even between a nudnik and a nebekh." (Rosten)

"And to Miriam he said, 'if you, Miriam, don't take him in hand and make a man of him, then he will be a shmagege forever, and you two can put away your teeth and be prepared to starve'" (source)

“Don’t give me that shmegegge!” (NJY)