Translation of a slang for 'mutual flattering'
Depending on the context and situation you can consider some of these:
自嗨
Douban

因为难以忍受这种circle-jerk话题的自嗨臭屁。


I originally wrote this as a joke but I think it's quite apt:
互相捧场，共同成长(cháng)
I won't explain it here though.