"Mole" can mean several things
1) A mix of marijuana and tobacco that is smoked out of a bong, usually the whole mix is smoked in one rip. The ratio of marijuana to tobacco can be what ever the smoker wants; when it's all tobacco it's called a slappy.
2)If the C in Cole was replaced with an M, then Mole is the word.
He confessed that he had been a KGB mole for almost a decade and had provided the KGB with secrets that compromised more than 100 CIA operations in Russia.