No-one's mentioned celery.
Something reminded me of the now-banned football chant
(various beginnings, one being "Fillery" - the name of a 1980s Chelsea FC player. And thenπ
If she don't cum/I'll tickle her bum/With a stick of celery
Which in turn reminded me of how, in the distant past, a clique/secret-society of elite football supporters - not for Chelsea but some other team further to the south - would "initiate" a new member by burgling the grounds, pulling the guy's pants down and stuffing celery stalks up his shit-hole.
Of course if you're thinking "vegetables = dildos", then you will be asking - What would be the point? If it's meant to be an implicitly-homophobic abasement ritual, then...celery = what "effect" does something as thin and fragile as that have, versus a cucumber?
Typical me, the only thing I can think of is that it might have a laxative effect. A variant version of The Celery Chant - the sort you might try to pass off as child-friendly (in the pre-PC/pre-modern-puritanism era) went like this:
Ask old Brown to tea/And all his family/If he won't come/Then you tickle his bum/With a stick of celery
Like all things in folklore, that has to have two or more meanings....