A popular colloquial term coined in Northern Ireland as an alternative for the american phrase dry humping which is usually used in reference to the sexual activity commonly practiced by young adolescents as they essentially attempt non-penetrative sex through their various items of clothing (typically through denim jeans or nylon infused jogging bottoms)
14 yr male : saw you and that girl at the under 18 disco last night.
Friend : yes mate we were dummy buckin' the life outta each other