When you unks is younger than you.
I have to go babysit my lil unclet..
A little baby looking uncle of yours, either very little or just baby like features
Hey Timmy, what do you think of your Unclet Steve
That one uncle that's a literal child.
The uncle who's a big man-baby.
My Unclet Charles is no fun, he just wants to play with baby toys.
Look at Unclet Dan! He's such a wuss.
Assorted goofy shenanigans performed by yer parent's brother.
If both AUNTics and UNCLEtics occur during da same family visit, everyone present is likely to have a really uproarious time!