Broken-winded, or in a bloated state in which the wind is
short and difficult. (French, poussi-f, same meaning.)
A fat and pursy man.
Shakespeare has “pursy Insolence,” the insolence of Jesurun, “who
waxed fat and kicked.” In Hamlet we have “the fatness of these
pursy times” —i.e. wanton or self-indulgent times.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894