Being ignorant like a lighter.

someone who is ignorant and/or crazy

(crude slang, cuss word) someone who is ignorant and unpleasant. Literally means bum or anus.

used to describe someone who is completely inebriated at all times and knows how to fuck shit up even while blacked out

someone who is an idiot and ignorant at the same time all the time

to ignite sth. = to set sth. on fire
to ignite = to glow ; to light-up
to ignite (fig.) = to start sth. ; to get sth. going

When someone is too stupid to be considered ignorant.