Dave is an absolute dumb ass that can't figure out anything. He is annoying and a horrible friend. He will do everything in his power to tick you off. 🖕For you Dave
A way of greeting Thai transsexuals thus informing unsuspecting mates to the said Daves gender. Taken from BBC's Only Fools and Horses.
On seeing your friendschatting up a suspicious looking female approach the couple and open with the line 'Alright Dave?' Repeat till your drunken friend takes the hint or step back and enjoy.