A bug in poker is a limited form of wild 7️⃣ card. One or both jokers are often added to the deck and played as bugs.
In draw poker played for high 7️⃣ and pai gow poker, the bug is considered to be an ace, unless it can be used as a missing 7️⃣ card to complete a straight or a flush, in which case it becomes the highest[1] card which can complete the 7️⃣ hand.
K-K-Joker-5-2 is a pair of kings with an ace kicker.
is a pair of kings with an ace kicker. A-A-Joker-9-4 is 7️⃣ three aces.