Spungus is a fungal growth caused by gungus. One might describe spungus as 'mushrooms growths' as well. It has led to the popular saying 'Rangle Rangle Spungus'.
Spungus is also seen as a delicacy in some parts and is frequently attributed to being a prime ingredient in the gels that cause the feelings of Tongle.
"If you have Spungus, you may want to see your physician immediately."
"Oh man, Spungus is the best thing about this ointment. It feels great in my nether areas."
A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.