noun

• (obsolete) A pustule.
• (obsolete) An annoying, worthless person.
  "I have rubb'd this young quat almost to the sense, And he grows angry."

verb

• (transitive, obsolete) To satiate.
  "1757, Samuel Foote, The Author, Act II, Scene ii, 1765, The Dramatic Works, Volume 1, page 28, Mrs. Cad. Well, come, begin and ſtart me, that I may come the ſooner to quatting——Huſh ! here′s Siſter ; what the deuce brought her !"
• (Scotland, dialectal, transitive) To relinquish, forsake, give up.
  "Ye hae grown proud since ye quatted the begging. — Scottish proverb, said satirically."
• (Wales and Southwest England, dialectal, intransitive) To squat or crouch down.
  "Tho' B-lt-n, quatted in the hall, Her jolly r-mpfs display'd, The size of it amaz'd them all, and Hector quite dismay'd."

adj

• (Scotland, dialectal, with "of") Free; no longer involved with; quit.
  "My word, I gie him nae encouragement ! I canna bide the sicht o' him, and wad gie the best gown I hae to be quat o' him.""

noun

• (chemistry) A quaternary ammonium cation or compound.
  "“Because quats are positively charged, and skin proteins have a slightly negative charge, quats like to attach themselves to skin,” said Greg Nole, a manager at Unilever, the parent company of Vaseline and Dove."