gosther
To talk loudly and impudently; to boast or bluster.
[H]e was always talkin' one nonsinse or another; an' among the rest o' his fooleries, he purtinded not to b'lieve in the fairies, the Leprechauns, an' the Poocas, an' he evin sumtimes had the impedince to purtind to doubt o' ghosts, that every body b'lieves in, at any rate. Yit sum people used to wink an' luk knowin' whin Failey was gostherin', fur it was obsarved that he was mighty shy o' crassin' the foord o' Ahnamoe afther nightfall[.]
Where it comes from
The OED suggests derivation from Middle English galstren (“to make a noise or outcry”) (found only in the Ancrene Riwle), but the Middle English Dictionary glosses this same word as "to stink". Compare Middle Low German galstern (“demand shamelessly”), Old High German galstar (“chanting, crowing, an incantation”).
Adapted from the Wiktionary entry gosther (CC BY-SA 4.0).