Kōhai, meaning junior or student.

a fucking wannabe-japanese weaboo

There are different name honorifics in the japanese language, more info can be read here,
japanese.about.com/library/blqow38.htm

en.wikipedia.org/wiki/Japanese_honorifics

Help case closed.
(Can someone get a mod here before the awkward silence? Kthxbai)

oh god I nearly choked on my strawberry milk

but yeah, question closed