Coined by famous short black king streamer Kai Cenat. Also used by lgbtq+ streamer yourragegaming.
It is a version of Gangy, to refer to someone as a close friend, similar to Gangatron, Gangalanch is a step above towards true gangy perfection.
Kai Cenat: That's fucked up gangatron
Yourrage: Absolutely true Gangalanch.
Kai Cenat: Yo word, indeed gangy
BruceDropemoff: You okay Gangalanch?
3. Essentially not giving a fuck about what your doing, feeling, etc.
David: Bro whats up with your project? It looks like shit!
Juan: I'm too tired to care.
David: Come on man, you can do everything all tangalanga like that.