Banksy’s "Stop Esso" (2000/2002) is a stencil mural protesting oil corporation ExxonMobil, featuring the text "STOP ESSO" and often a dripping, vandalized sign. A 700-pound piece of this mural was featured at his 2002 "Existencilism" show in LA, and it is a key example of his early anti-corporate street art. 

The work appeared around 2000, with a major piece featured at the 2002 Los Angeles Existencilism show. It is a direct protest against the oil company Esso (ExxonMobil), targeting corporate greed and environmental impact, notes Banksy Explained.

The piece typically uses stencils, spray paint, and sometimes, for the "Stop Esso" slogan, a hand-painted, dripping effect to convey a quick, urgent, and illicit, anti-establishment message.

Significance: It was one of the early works that established Banksy's reputation for using public spaces to critique major corporations, according to Banksy unofficial.

The "wall" often mentioned was a 700-pound segment cut out from the 2002 LA show, highlights StreetArtNews.