Acronym similar to "brb" (be right back), but with emphasis on a bodily function performed during such hiatus. BRBGP standing for "Be Right Back, Gotta Poop"
John: Lets go get lunch Mej: brbgp
Mej: ok, back...I feel like a new man. lets go get lunch
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.