Ní gilla i ngillaidecht é ...
Ní gilla i ngillaidecht é, ní óclach i n-óclachas, ocus ní gaiscedach i ngaisced.
(is not * page * in * pageship * he * is not * squire * in * squireship * and * is not * knight * in * knighthood)
His actions befit neither page nor squire nor knight.
This imprecation was delivered, entirely petulantly and inappropriately, by Gúaire against Finn Bán after losing a series of fidchell games to him. This episode is found in "Acallam na Senórach". I have restated the line slightly, shifting it from indirect to direct speech, and normalizing the orthography to the Old Irish norm. I have also, rather more radically, translated the threefold insult in terms of Anglo-Norman chivalry. In more Gaelic terms, the "gilla" was a serving boy, the "óclach" was a young warrior, and the "gaiscedach" was a seasoned champion.
The original text is "Adubairt nár' ghilla a n-gillaighecht h-é, & nár' óclach i n-óclachus & nár' ghaisceadach a n-gaisced." (He said that he was not a page....) A very similar formula is found in the short tale "Erchoitmed Ingine Gulidi", where it is used positively to praise Gulide:
"Is amlaid immorro bái Gulide, co mba laech ar laechdacht ... 7 co mba feinnid ar fheinnidecht 7 ba mílid ar milidacht 7 ba brugaid ar brugamnus 7 ba cainti ar caintecht." (Thus indeed was Gulide, having been a warrior in warriorship, and a fenian in fenianship, and a soldier in soldiership, and a landholder in holding land, and a satirist in satire.)