It's basically having a feel while fully clothed. Usually the first 'sexual' experience (i.e. beyond holding hands or a kiss) which a young lad might hope to get.
According to Sid the Sexist whilst under hypnosis in a recent episode of Viz magazine: I've never done it with a real lass. I once gorra cloth tit off a lass at a party. But that's as far as I've gan.
by PaudyMac December 14, 2015