An allergic reaction to the oral ingestion of semen can result in crums, low viscosity diarrhea.

When something is really bad or gross. It's short for crummy.

Your Penis.. A quote from Borat film "Please,Touch my crum"

Someone who is such a lowly human being they do not deserve your time of day.

When you cringe and cum at the same time.

its like cum but like not really

Crum is the alcohol mixture of cream soda^ and rum*. One shot of rum mixed with a bottle of cream soda will make the rum almost tasteless. Typically a 1/3 glass of rum and the rest cream soda will make for an enjoyable harder mixture know as a Pro-V mixture. Ice is not necessarily needed but is preferred.

* Clear brands of Rum are typically used (BACARDI®)
^ IBC® cream soda is the preferred brand.