The use of words in a choppy, poorly-spoken manner that generally shows, especially in online games, extreme n00bness and/or a lack of skill with the English language.
The intentional use of such in a joking fashion originated on Darktide of Asheron's Call, by two players named Debuffus Maximus and The Swedish Chef.
Did you hear that noob over there using lubnerspeek? Man, I don't know what the HELL that kid is saying.
YAYAY BUY BUY TRUBN! YA YA BUY BUY KIDDY! HLEP HEL>P BUY BUY! yayayayaayjjajajaj! BUY BUY!