Sussy baka

The term 'sussy' (short form 'sus') is used in the game 'Among Us' to describe one who is shifty or suspicious.

'Baka' is a term in Japanese relating to a 'fool'.
Sussy baka therefore means 'suspicious fool'.

friend 1: "you're such a sussy baka!!!"
friend 2: "what the hell are you on about you fuckin plonker mate"
friend 1: *dies of sussiness*