Bleahflemgal is the expression of feeling MEH or annoyance.
It is a combination of going bleh or blah but you have a mouth filled with saliva so you flem up when making the "eh"/"ah" sound... gal is just on there for good measure as bleahflem doesn't sound as good as bleahflemgal.
This word was made up and coined by Anthony DonaldBrown (Antpie) First when in a skype chat with Lauren Emily John (LilMsDynamite).
This monument in history set nothing in motion appart the creation of a pretty awesome word all people from anywhere in the world will understand how you feel if you say it.
How to use Bleahflemgal 101 Person 1: *has a drink after a bad day at work*
Person 2: Hey how you doing?
Person 1: *drink causes flem mouth* " Bleahflemagal"
Person 2: Oh I see, not that great then, too bad.