When you rub your nipple on a cold pole.
I could use a nilpole right now.
When you fart into a lighter creating a large blaze due to the highly flammable gas, with intent to put something or someone up in flames.
"I think our Flamethrower ran out Sergeant Bob,"
Sergeant Bob: "You boys know how to do an Indian Flamethrower?
'fentbomb' is a term centered around ice hockey, in which it describes a hard slap shot, or a large hit, most commonly used to describe a 'dirty' hit.
If someone were to get body checked really hard, but it was a rather illegal body check within the rules of hockey, it would be called a fentbomb
"Oh by golly, that guy just got absolutely rocked, perhaps that was a fentbomb"
."Oh number 10 is an absolute fentbomber'