one who is usually very outgoing that instantly becomes shy around someone they think is hot and/or have hooked up with in the past, a dead give away to past indiscretions. usually happens when one is with current boyfriend/girlfriend
1)"She became a total shy sheep when he walked in."
"Dude, that's because they hooked up last summer"
"FML we were going out then"
2) "Totally glad i didnt shy sheep it when she walked in, I would of got caught up."