Green’s Dictionary of Slang

scrav v.

[? SE scavenge + scrape up; note dial. scravvle, to grope with the hands]

(UK juv.) to borrow or steal (usu. money); thus as n., the borrower or thief.

OnLine Dict. of Playground Sl. [Internet] scrav n. v. 1) borrow or steal from someone (usually money). 2) the person who does this.