Lamer (emphasis on "a") is a mockingly-humiliating designation of a newcomer, an inexperienced person and a devil does not understand the topic.
The English word "lame" is finally pronounced as "a lame," but that's another story. And in translation into Russian it means "lame", so lamer is the one whose knowledge and skills on this subject are significantly limping.
Example of use: although you studied for a programmer, in terms of SEO, you seem to be a complete lamer! Or: such a lamer in chess, like me, does not make sense to watch the analysis of the games of grandmasters.
Lamer is in the list: Slang