Speak now, or forever hold your piece
Refers to where da irate "paw" of a redneck chick is permitted only one opportunity to protest a horny stud's getting his "little pumpkin" preggo before he is permanently barred from demanding a shotgun wedding.
In da infamous "history of da yodel" tale, da enraged farmer unwittingly missed his single chance at recourse against da nameless traveler who had "gotten it on in da hayloft" with both his daughter AND his wife da night before --- said sly seed-spreader simply "had his fun" and then quietly slipped off far away before da man even knew what had happened --- and thus said furious family-head was made a victim of da old "Speak now, or forever hold your piece" scenario.