1 definition by Old Sweaty Man 69
To ejaculate onto a Mc Vitties Jaffa Cake, and then possibly give it to your sister so she can experience that salty pleasure
1. "Josh just Jaffed on that JaffaCake, he offered it to his sister." (He had cum all over the now soggy Jaffa)" 2."She loved the sight of him jaffing furiously last night"
by Old Sweaty Man 69 January 27, 2016