past participle of throw a sickie

Alternative form of if I do say so myself

(idiomatic) To conceal something about oneself, without the knowledge of which others cannot know one's true character or perspective.

(American spelling, biochemistry, steroids, pharmacology) A natural estrogenic hormone that is a ketone C₁₈H₂₂O₂ found in the body chiefly as a metabolite of and less potent than estradiol, that is...