The act of having sexual intercourse with a slag, and then regretting it later, often followed by attempts to forget it by spreading around rumours about her cleanliness, and the aroma of her private parts.
Tom: 'Hey, you remember sharna?'
Jordan: 'Ahh don't remind me, she was such a SlagShag'
Tom: 'Did her vagina really smell like mouldy tuna?'
To sneak or stalk off salubriously away from the scene of a crime.
Ebony kicked a bouncer three times because he tried to steal her phone to get her number... then she had to slashagg away because he started getting agro.