Twat wank
When a guy and girl hook up but there's no emotional attachment on his part, so he may as well be using his hand, but is too lazy/ it feels better with the ho.
Ben: "Hey Nick, are you and Sarah together now?"
Nick: "Nahh mate, she was just a twat wank if I'm honest..."
OR
"I'm so f**king horny, but I cba to DIY...I'm gonna call Molly for a twat wank"
Nick: "Nahh mate, she was just a twat wank if I'm honest..."
OR
"I'm so f**king horny, but I cba to DIY...I'm gonna call Molly for a twat wank"