Bepiss

they never bepiſſe and drench themſelves with this peſtilent excrement, […] for they cannot abide themſelves their owne urine

I ſhall be piſſe my breeches if I cowre thus

laughing, till they bepiſs'd themſelves

So Ditton and Whiston may both be bepissed on / And Whiston and Ditton may both be beshit on.

he has bepiſs'd the bed.[…]yes, he has wet it through and through

"[…] till thou bepiss thyself and befoul thy clothes."