Chuck somebody under the chin American informal
To Touch someone like children under their chin in a gentle way in order to show your love, and care
Please don't chuck me under the chin, I'm not a child.
'Merry Christmas' she said and chuked her son under chin.
I chucked my daughter under the chin because she was so lovely.
The verb "chuck" should be conjugated according to its tense.
There is no clear information about this expression, so the origin is not certain.
A legal matter that is very easy to solve
The house owners didn't lock the doors before going out, and that's why they got broken in. This is an open and shut case.