the deformation of a stream of urine (usually split in half like a snake's tongue) caused by a prior masturbation session, that has allowed the semen to dry inside of the urethra. usually accompanied by a surprised look from the pisser.
when you roll a blunt so packed it looks a bit green (this doesnt really matter, the snake tongue bit is at the end so it can be a joint too), then you twist the end and split it in to two bits of paper and roll them up to make it look like a snake tongue.
make a snaketongue, take a pic of it and post it on here. thanks :)