Similar to a Rusty Trombone but instead of going for the rudimentary reach around use three fingers to massage the gooch or genitals. Can also be named the 'Rusty Trumpet' but it is called Funnell due to the inventors actual Trumpet playing ability.
Lucy: Do you fancy a rusty trombone tonight?
Dicky: No thanks babe i fancy a slightly higher pitch.
Lucy: How about a rusty funnell?
Dicky: Thats my girl.