The dictionary definition ain't right. Imagine a small guy who wanders into a biker bar, orders a beer, and then starts asking the denizens rude questions about their taste in [music/vehicular transport/clothing]. And not because he's drunk and wants a fight, or because his girlfriend's left him and he's feeling so self-pitiful he wants to get himself beaten up, but because he doesn't care: that's a bampot. Bamports are dangerous. Suicide bombers would be bampots if they weren't politically motivated; as it is, J. Random Bampot is basically a bomb waiting to explode. They're dangerous fuckwits, and I feel it's about time we extended the definition to cover bampots with chemical weapons and machine guns, as well as the usual bampots with knuckle dusters, chibs and sharpies.

See also: http://www.glasgowsurvival.co.uk/.