Green’s Dictionary of Slang

paipsey adj.

[? UK dial. papes, a flour and water gruel, also a foolish youth; ult. SE pap, soft or semi-liquid food for infants or invalids]

(W.I.) insipid, weak, unattractive.

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[WI]F. Collymore Notes for Gloss. of Barbadian Dial. 83: Paipsey. (School slang) Of insipid or unattractive appearance.