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1.
doing anything at a fast pace.
'stop hearning about and relax'
by monkey March 16, 2005
 
2.
Also spelt as "hern" or "hurn".
Gloucestershire slang. Originating from teenagers who hang out at Gloucester Cathedral,

hern" is another word for "cigarette" (preferably a "roll-up").
"begs you a hearn dan"

~or~

"Can I have a cigarette, please?"
by ZaccyHB September 08, 2013