beach walk

The act of moving your hand surreptitiously down a woman's (can be your own) body from the breasts to the pubis, then just slightly over enough to feel the 'lapping of the sea'

Girl: "What's your hand going south for Grant?"
Boy: "Oh, just a beach walk.."
OR
Girl: "I was in the shower and my hand was going for a beach walk. Before I realised... it jumped straight in the surf"

Cassidy

When a conversation you think is going to be sensible and serious descends into flirting and innuendo so crude your toes curl and you laugh out loud on public transport.

Did you have a chat with that girl last night
Yeah... it went cassidy so quickly, she's got a filthy mind.