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Princeton piggy back term comes from the Princeton range of piggy back forklifts for trucks

where a small unit straddles a large truck with its forks

translates into sexual conduct with a small female riding a larger male subject with a strap on instrument also when a smaller male has infatuations with larger women and conducts intercourse
"Taking the big boy home to give him a Princeton piggy back"

"look at the jockey taking the pig home to Princeton piggy back her"
by ladydeath May 30, 2013