A former LSU student (Tiger) who ends up going to grad school at Texas A&M (Aggie), hence Tiggie (Tie-gy).
According to Stephie K and Tyler, "bred for its skills in coolness and intelligence."
"Didn't Stephie gradutate from LSU?"
"Yea, but now she's a 2 percenter at A&M. She's a tiggie."