Definition: 4th last.

A word constructed nearly entirely from affixes, all from Latin: Pre (meaning ‘before’), ante (meaning ‘before’), pen (meaning ‘almost’), and ultimate (meaning ‘final’).

This also transmogrifies nicely into a noun: Preantepenultimatum.

Often heard in supermarkets, hissed in weary voices at small children.

‘OK… If you do that one more time…’