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This is when plans are made to do something or a way of doing things has been established, but then some know it all assfuck has to chime in with his/her bright idea. The consequences and repercussions of said assfuck throwing a monkey wrench into the clockworks is what ruins everything that has been running smoothly otherwise. This then causes confusion much like if a applecart would spill out and apples would roll all over the place in a crowded market.
Tony : Why is skippy trying to change the trip plans at the last minute, they were set in stone months ago?

Mike : I don't know that mother fucker is just trying to upset the applecart.
by TV CAR March 26, 2010

Words related to Upset The Applecart

upset applecart assfuck capsize crash flip monkey wrench plans upscuttle