Popping in the ear; Clicking in the ear; Ear fullness; Ear pain; Cause of Eustachian tube dysfunction or blockage include: Allergies; Sinus infections; Ear infections; The common cold Treatment includes home remedies to relieve pain and several maneuvers (swallowing, chewing gum, yawning etc.), which can be done to improve Eustachian tube function.
Definition of pub. 1  1 chiefly British : public house 2. 2  2 : an establishment where alcoholic beverages are sold and consumed.
The term pub, short for public house, originates in the UK so I'm going to define what if means there. The term is used internationally and has taken on different meanings elsewhere. NB Originally posted as a comment to John Hawkins, but promoted to standalone answer.