Double Batch 

When you urinate in the same sitting that you defecate it is called a double batch.

Double batch when you can, the water bill was pretty high last month.

Double Batch by Mattias Jarchs March 18, 2017

Double Batch 

When a girl dyes her hair on her head and also her pubic area so they are the same color

Hey, look at that girl with the dye job, I wonder if she got a double batch, so she has a snatch to match

Double Batch by Ctdude April 9, 2010