To hirple is to limp,I take twa fested to be two fisted, although this would not fit with limping. Gab is mouth or pertaining to speech, i.e. to gab is to gossip or shoot the breeze, and is I presume the root of gob e.g. " Shut yer gob " Daunton is old usage of daunt " Bold brave and undaunted, rode young Brennan on the moor " Pow of course is head. "A blessing on yer frosty pow, John Anderson ma jo" I was born in Glasgow, and brought up around there, up to age 17, and many of these words were still in use then, but some I can't understand at all although a lot of Burns stuff is in Ayrshire dialect, a region not too far from Glasgow. People didn't travel much in those days so some words are very localised indeed.
Failte.....Giok