a) any strength, 5 cards in a specific suit known only to opener and his partner
b) any strength, 4-4 in two specific suits known only to opener and his partner
East asks what the bid means, and is told "weak, 5 hearts and at least 4 in a minor".
South passes.
West makes a re-opening double on this hand
North passes, East passes for penalty, South bids 2♠, West doubles for penalty
North bids 3♦, East doubles for penalty, South bids 3♥, West passes
Noth passes, East doubles again for penalty, passed out.
NS get a disastrous score in 3♥ doubled, and ask for an adjustment to 2♥ undoubled, because West had UI from East's question.