twonager

Etymology
(by analogy with ), due to toddlers of this age ostensibly resembling the difficult attitude and demeanour stereotypically associated with teenagers.

Noun

 * 1)  A two-year-old toddler who is now more independent and difficult, involving refusals, demands and tantrums; a toddler experiencing their terrible twos developmental stage.

Usage notes

 * Less common than.