People are using "real talk" which to my frustration has actually entered my normal thought processes, though thankfully I have yet to utter it aloud.
Also of note since you're in Japan, some peeps here use "wacky jappy" which bothers me but I usually keep my trap shut about, and others are fond of saying "two bombs were not enough" in reference to Japan, to which I usually cannot resist a firm fingerwag.
"Firm fingerwag" itself seems like it should be an imaginary sex maneuver of the "Dirty Sanchez" or "Donkey Punch" variety.
Other than that, there is a lot of :fml and :smh for "fuck my life" and "shake my head"
For the record, I prefer

to

-- and I don't even know what "fbm" means.