Como dizer "mão boba" em inglês

Me ocorreu o uso de 'na*ghty hands', sugiro fazer uma busca no Google e vai poder verificar que faz sentido.

Exactly Lu! You say wandering hands.

Check this out guys: Wandering hands (British & Australian humorous)

A person, usually a man, who has wandering hands often tries to touch other people for sexual excitement

Ex: Joe was notorious for having wandering hands and all the women tried to avoid going into his office.

Ref. idioms.thefreedictionary

Take care,

Handsy

Some of the MPs are accused of being gropers, with several described as “handsy”. The Guardian

Feel someone up
To touch someone sexually, especially someone you do not know, for your own excitement:
That's the second time she's been felt up on the Metro
Ref. dictionary.cambridge