The act of maintaining an erection by masturbating with one hand and fondling your testicles with the other while performing oral sex on a woman.
Bro 1: Yo bro I heard you munched mad box last night.
Bro 2: Yeah dude I was down there for 20 minutes but I pulled the Lumberjack brunch munch to stay rock hard and I laid the Dong right after.
The act of taking a girl out for some delicious brunch then taking her back to your place to "munch" on her vagina.
"Dude I just took Sheila out for a Brunch and Munch, it was awesome!"