terrible two's
No matter how old this kid is, they are always in their Terrible Two's when you have to babysit them.
Oh, you'll have to bear with Melanie - she's in her Terrible Two's.
Terrible Two’s
The terrible two’s definition should be changed from being “the age of two” to being the age starting from a year and a half to the age of three” because the terrible two’s always last for two complete years not just one complete year.
Oh my, I can see the terrible two’s are beginning for little Sarah. She’s barely one and a half. It’s going to be a long two years.
Terrible Two's
A sudden, extremely urgent need to defecate.
From "Whose Line is it Anyway" (Scenes From a Hat) 'Adults still experiencing the Terrible Two's'. : "Jim, I've made a decision about that promoti-- *GASP* Ooo!... *hobbles towards restroom*" (struck by the Terrible Two's mid-sentence).