The act/habit/lifestyle choice of bumming darts or drugs or money off ya mates but in a minor almost more acceptable way
for example;
"Aye Damo bro do you reckon you could save us a couple tokes of that Durry bro? Haven't had one all day"
"Fuck Wayno you're always keeching, fuck it here have the rest of this one I'm goin' inside"
'Hey Mum do you have a ciggie I can pinch for the mix'
'You're always keeching aren't you Tommy'