abreviation of 'professional bail', means to jump ship or just straight up run away. It's professional if you do it on the down low so noone even knows your dogging it.
husband "hay baby iv had such a long day rekon you could help me relax?"
wife "i think iv got an infection or something have you got someone on the side?"
husband "ummm im just gonna go out for a smoke ok hun"
*pro bail/run for hills