tickling the pear
Euphemism for mastubation. Orginated in the Harry Potter fandom. It comes from the fact that to gain entrance into the school kitchens, one must tickle the pair on a painting of fruit guarding the entrance. Hermione Granger learns this when the Weasley twins let the secret slip.
Harry bit his lip, trying not to let a whimper escape as he tickled his pear, fantasizing desperately about Dobby the House-elf.