An emotional bid is a request for attention from someone, or an invitation to connect, like smiling at a friend, asking your partner about their day, or pointing out something funny to your colleague.
An affordance refers to features of an environment that enable you to interact with it. For example, a chair may afford sitting, lifting (being lifted by a person), climbing etc. It depends on both the object's attributes and your capabilities. For example, a staircase affords getting to a higher floor, but not if you are a baby who can't climb the stairs.