This expression means to be in trouble or in difficulty. The allusion is to the ancient way that unwelcome guests were sometimes warded off by heaving a kettleful of boiling water, when available, upon troublesome intruders. The saying is known in English since about the beginning of the sixteenth century.

Übersetzung:

in Teufels Küche kommen

Gegenteil(e)

The opposite of "to get into hot water" is "to have no problems".

Synonym(e):

You could also say: to get into difficulty.