Person who drives slow in the left hand lane or drives the same speed as someone who is the right hand lane. Either way, there is no chance to pass. It's a play on words for "left laner."
When ye walk in the larbert high and see big deppresed angus the first stage starts ye start to piss yer pants laughing because she is trying to get her pills out her purse she then cunts it on the floor that's when stage 2 starts ye shite yer self big mr auld walks through and pulls out his 30 mile long dick and pits it in big Angus wile also smoking stardog this is all caught on the cctv he then cunts it and then ye fuck both there bodies down the void and it hits some cunt in a wheelchair causing brain damage
Before the rise of the Internet, it was largely used amongst the Amiga pirate, as well as, the demo-scene community.
A lamer would be a wanna-be hacker with absolutely no coding/cracking skills at all.
Also, it was used as an insult between rival pirate groups.