According to merriam-webster.com, lisk means groin. It's of Scandinavian origin: "ME leske, of Scand origin; akin to ON ljōski groin, OSw & ODan liuske; akin to OE lēosca groin, MLG lēsche groin, MD liese thin skin"
Way back - when GN was quite new - I was one of the lucky recipients of one of their early "giveaways" - a sample bundle of lubricants. I never knew that there were so many different kinds. It would be really nice if the powers-that-be at GNHQ would repeat this freebie so that other GNetters could have the fun and delight that they gave to me. Come on HQ - any more where they came from please?
I had a N Irish friend who often used the expression "Up to my otters" as in really busy and a bit overwhelmed. I think the funniest one is "front bottom" and "back bottom". I think a lot of women are convinced their front bottoms smell and need deodorising. Particularly if there is any prospect at all of oral sex. One of my all time bad bits of "advice column" advice was from Katie Boyle re "how to stay fresh after having a baby". She advised a feminine deodorant spray. Ouch. I think she had never had a baby herself...
Yes lisk is groin in NE terminology. Also front bottom and back bottom is still much in patientspeak. Either they don't know or like to use the exact words.