sacrificial biscuit
When you have opened a packet of biscuits and eaten a few and then leave them for a couple of days, the top biscuit in the pack will go stale, but in doing so, will keep the rest of the biscuits fresh - it is deemed the sacrificial biscuit...
Person 1 - "Yeah I'll have a biscuit, but don't give me the stale one at the top"
Person 2 - "don't worry bro, I would never give a homie the sacrificial biscuit"
Person 2 - "don't worry bro, I would never give a homie the sacrificial biscuit"