Besides the golf club, A sandwedge is when you see a guy/girl from a distance who may look good from far away, but when up close does not look good. Equals Epic Fail!
Tom saw a girl from 30 ft away and said, "Damn, that girl is hot!" But upon getting closer he realized her face was covered in zits. "Lol, you fail" Tom's friend Joe laughed, "She's a sandwedge!"
Someone who looks good from a long distance away, but upon closer inspection, is ugly. Like a sand wedge, good from 75 yards.
I saw a hot girl across the club, but when I walked over it turned out she was a sand wedge.