Green’s Dictionary of Slang

scav n.

also scavvy

(UK juv.) a scavenger, used as a general insult.

OnLine Dict. of Playground Sl. 🌐 scav, scavvy n. (derog.), adj. dimin. of scavenger. Calling someone a ‘scav’ implied they were likely to take things which had been thrown away (eg ‘scrambled ’ pennies), but more often used a general put down.