Typically said by people of a sub-average IQ in relation to things that are indeed, rather important.
Dude 1: Hey man you should probably look at applying for some jobs?
Dude 2: It might sound super duper important, but its really not
Chick 1: Hey sis you should probably not do drugs and then drive around, the police might catch you!
Chick 2: It might sound super duper important, but its really not