Giving it your all. Shannon (Ireland) was known for having. Particularly difficult bells to ring due to weight and energy required to ring them.
The bell ringers would often appear red faced and spent. This in turn became a euphemism for giving it your all during intercourse.
Whoa Patrick your face is red and your sweating like a priest in brothel, so y'are. Sure what have you been doing?
Dont worry Brendan, sure Sinead came round and ive just give her the bells of shannon. Ill be right in a minute sure i will.