Congolese credit card
n.— «Thousands of gunmen continue to roam the lawless east armed with their AK-47s—known to some as the “Congolese credit card”—harassing and killing civilians.» —“AK-47s known as ‘credit cards’ in lawless Congo” by David Lewis in Bunia, Congo Star (Malaysia) June 19, 2006. (source: Double-Tongued Dictionary)