Welching

[Greta]

Welching is the [clunking] of the base of a beer bottle or glass, whilst making various [grunting] or pirate-sounding noises such as arrrrrr, or oarrrrr... etc etc. This is as opposed to clinking or chinking of the top of a bottle, and it perceived as far more masculine when in a group of lads who are all very drunk, and in agreement of a certain point of topic.
It is often accompanied by the raising of ones right elbow upwards, whilst making other peculiar noises, that would suggest that one has slightly [lost the plot].

[Vania]

present participle of welch