"fenti" is a word of many different meanings. One sentance this word could be used in, for example is... "you fenti bastard, you!" translating "you corner shop bastard you!" or the old fashioned "you nig-nog bastard you!".
"fenti" could also be used for a cowerdly act such as being too scared to jump off somthing.
you may also find young kids refering to there walkers crisps as "A fenti of crisps" rather than "a PACKIt of crisps".
"dont waste good horses send in a couple of fenti's".