aww man i crapped the bed on that math test  he sure crapped the bed on that test  so far im crapping the bed on this unit
crapping the bed means to do so horribly bad on something such as a test
"aww man i crapped the bed on that math test  he sure crapped the bed on that test  so far im crapping the bed on this unit" What is the definition of "crapping the bed"?