Extremely offensive insult in Scotland, similar to dafty. Use against neds and junkies at your peril. If one junkie uses it against a fellow junkie it can result in a hilarious verbal battle until one stabs the other, which is equally hilarious.
Usually one junkie baits the other into violent reaction so that he can claim damages in court by saying "Ya fuckin' bam". However, there is actually no space inbetween each word when a junkie uses it. Infact, the faster you can say "Yafuckinbam" the more powerful junkie you are.