Based on the UK store name b&m bargains, popular for being cheap and "jippo" saying someone has "b&m broadband" states they have a rubbish connection and a cheap internet,
mainly when playing on a video game and lagging.

jarrin means annoyin

Someone named Gavin, that is rude.

The act of a butthurt party goer who leaves a party full of intoxicated youth to report them to local authorities, thus protecting themselves from consequences and getting revenge

An elephant.

doing large amounts of dip.