What is a howdy in bed?

"Howdy" is a colloquial greeting commonly used in the southern United States. In the context of being in bed, saying "howdy in bed" could be a playful or flirtatious way of greeting someone first thing in the morning or before going to bed at night. It could indicate a lighthearted and affectionate way to acknowledge the other person's presence or to express a sense of comfort and familiarity.