It's a term that recently used a lot on social media by Indonesians.
Fafifu or fafifu wasweswos basically means bullshit or nonsense. People usually use it to mock Mr. Know-it-all, or someone who try to appear smarter by using big words, or someone who act like everything they say is very deep and meaningful
"He always fafifu wasweswos about climate change but he still doesn't want to turn off the air conditioner"
a winged insect with a stinger at the end of its abdomen to protect itself or it's nest when threatened, similar to the defense mechanism employed by bees.
I got me stung by some wassesses when I tried to knock down those wass nessesses.