My old mum and my Father both used the word 'Gip' when referring to pain " Ooooh! my back is giving me some Gip today" I find myself using it now and my grandaughter asked me where it came from & why.
I thought one of you knowledgeable people might know. ThanQ
In the sense of swindle, gyp probably does come from gypsy, but - according to The Oxford English Dictionary - in the sense of pain it is probably a corruption of gee up, as in an order to a horse. That would quite often have been accompanied by a crack of the whip.
My apologies for the above answer. For some reason I looked only at the opening part of Mamy's link-page...the gypsy part...and thus failed utterly to see that the 'gee up' element was there, too! Sorry.