The abbreviation of "Allow it Brev", a cheeky low-low refers to asking for someone's vapour device and/or the spliffage.
Spastic 1 - "Yo wys bro"
Spastic 2 - *pinches index and thumb together* "Cheeky low-low"
Throat Goat and Mixing Genius
"Yo is that Rhys Ares???"
"Yeah man get the 33 Splitter out his grinder g"