To engage in acts of physical intimacy with a member of the sex to which you are attracted. Including, but not limited to, tongue, ass, pussy etc..
I got mushu from your mom last night (and it wasn't the kind you eat)
A condition of being or becoming flaccid during a crucial sexual juncture. Otherwise known as not being able to get it up.
Brian was hoping to get it on with Alexandra that evening, but in bed later that night he instead had to deal with a disappointing case of shock cock.