A way of saying "get outta here noob". To talk down to a new or bad player.
Bro I've killed you 16 times now, get out of my lobby!
A Foam Dart Blaster modder, however, using "janky" materials and techniques such as hot glue, popsticks, parts of other items instead of using more elegant and cleaner ways. The end product usually looks tacky, rough and of poor quality, yet it stands out and is unique, which is why the person who created such a mess is called a janketeer.
"Dude, he used an old Lego brick as a spacer, he's such a Janketeer"