NZ/Aussie slang for a individual who talks endlessly, often without regard for anybody who is waiting on them. Commonly used to describe chatty mothers.
when i was little my mum used to see her friend in the supermarket and gasbag for hours.
When a dude places his nutsack on his woman's forhead with his ass pointed towards her nose. Then he breaks wind while forcing his ass downward onto her face.
Laura passed out and Shaun lowered his ass onto her face and passed a Bulgarian Gasbag to end the evening.