Here are some more.....
1:
http://www.ralphmag.org/x-rated-videoV.html
"Shrimping" (has something to do with feet), "
2:
http://www.fraudband.org/gettingit/article/400
"the slang term for sucking toes, "shrimping,"
3:
http://www.libidomag.com/safersex/sexquiz08.html
72) toe-sucking is
B a sexual act which can be highly erotic for both giver and receiver, often called "shrimping"
4:
http://www.geocities.com/princeofprevention/5.html
Shrimping(Toe Sucking)