As explained in Introduction: Sales and Use Tax Basics for Various Types of Nonprofit Organizations, and Collecting and Paying Tax, when your organization is a consumer, your sales are not taxable. However, tax does apply to your purchase of the flags or materials used to make them.
Oy vey! (Yiddish: ××± ×°×²) is an exclamation of dismay or exasperation meaning woe is me or oh, no. This exclamation was borrowed from Yiddish. A related exclamation is vey iz mir (×°×²'× ×××¨)âwoe is me or oy vey iz mir (Yiddish: ××± ×°×²'× ×××¨). Sometimes, Oy is just used by itself.
Per the dictionary there is no shortcut for Hooray, but yay does does fit the pronunciation of Yippee-ki-yay! Yeah, or yea is short for yes. Yay it says means size, as in yay big.