tomfoolery; tom noun jewellery UK,1931 Rhyming slang. The abbreviated form is first recorded in 1955.
They’re not expecting to be turned over in the small hours and don’t bother to lock their tomfoolery away[.] — Charles Raven, UnderworldNights, p. 11, 1956
For a while we was on easy street with all the tom in Manchester. — Kevin Sampson, Outlaws, p. 15, 2001