1)when someone is doing something they shouldn't be doing or when what they are doing is annoying
2)what someone was doing when they were supposed to be hanging with you
"Where was he? Oh, he was tickling his gooch last night."
² A great way to get a buzz/adrenaline rush for all those involved
³ A cheap excuse to cop a feel.
Did you see that topless chick get tickled on the Howard Stern Show? That was hawt!
Tickling - If you can't watch porn, there's always tickling!
Sam: "what are you doing.."
Joe: "This is called tickling the lock"