The term spread across Europe with the Spanish and French translating it into filibustero and filibustier,  respectively.

Americans adapted the spelling and pronunciation to “filibuster” and expanded the definition to include mercenaries engaged in illicit military actions against foreign governments, referring in particular to Southern adventurers in Latin America.

In the mid-1800s, “filibuster” became popular in the U. S. Congress as a euphemism for delaying or blocking the passing of legislation by taking advantage of the procedural rules to hold the floor for inordinate amounts of time.    Senator Huey Long (D-LA) demonstrated a particular talent for filibustering, reciting everything from Shakespeare to recipes for Southern dishes for up to 15 hours at a time.

But, the term was also used figuratively to mean ‘a supply of money’ or ‘one’s livelihood’ (a farmer, after all, could readily turn pork into cash).

When 20th-century legislators doled out appropriations that benefited their home districts, someone apparently made an association between the profit a farmer got from a barrel of pork and the benefits derived from certain state and federal projects. By 1909, ‘pork barrel’ was being used as a noun naming such government appropriations, and today the term is often used attributively in constructions such as ‘pork barrel politics’ or ‘pork barrel project.’