Green’s Dictionary of Slang

-mans sfx

also -man
[the OED cites it as ‘unexplained’ but Partridge in DSUE and Origins (1966) suggests links with Lat. mens, mind, Fr. sfx -ment, SE man, a human being or Skrt -moni, mood or mind]

a state of being or a thing; see various combs. e.g. crackmans n., ruffmans n. etc.