The action or an act of loudly and repeatedly banging one's fist on a table, especially while speaking; (figurative) the expression of opinions in a loud or aggressive manner; tub-thumping.
Mid 19th century. From table + thumping.
Of a person: engaging in table-thumping, especially loud or aggressive in the expression of opinions; (of words, speech, etc.) characterized by table-thumping; loud, aggressive, and opinionated.
Early 20th century; earliest use found in Jerome K. Jerome (1859–1927), novelist and playwright. From table + thumping, after thumping.