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1.
To degrade or get worse. Coming from the idea that when you are sloping you are going downhill.
The peanut sauce they got there has really been sloping for awhile.
by Captain Bumbo November 07, 2010
 
2.
The act of a girl going down on a guy and teasing him with her lips and tongue working down his body before she gives him head.
She is sloping her way down his body with her tongue and lips until she reaches her prime destination.

Dude she is awesome at sloping, I got some last night.

Sara: "Make sure that after you go slopping, you wrap your tongue around him well."
by Jaxa February 09, 2014
 
3.
To Ski or Snowboard down a snow covered hill or mountain.
Do you want to go sloping tomorrow?
by J-Mac314 January 03, 2009