Double Guff Edit Meaning

1.

To break wind silently at the exact same time as the person you are nearest to thus creating a more putrid stink to which either party could be held responsible.

whilst sitting in a crowded church Sid let one go and on realising the gravity of the stench frantically hoped to have double guffed with his pew neighbour Maggie thus creating confusion over who laid it

or

Ged 'That stinks innit! yeah man that was mine'

Tezza 'nah bruv I laid that innit'

Pat 'yo dudes yo just double guffed buthzing man buthzing!'