"to stick the tongue out and hold it"

[Ju]

"She asked me to be quiet because she knew I am going to stick the tongue out and hold it"

What does it mean of "to stick the tongue out and hold it"

Thanks.

[Anglika]

It is not an English idiom, but from the context it would seem to be the same as "I can't keep my mouth shut" > Am only too likely to say things without thinking first.