It is a termed used as a substitution for saying anything that you are to nervous or afraid to say.
"How do you feel about Ronald" Jessica said
"blahhhh." Pete said
"blah?" Jessica said confused
by Pete man December 3, 2015
Get the blahhhh mug.
When a decently attractive thot sends progressive thotty pic and u go "BLAHHHH"
Blahhhh- Thot *sends thotty pic*

when trying to finesse hoe for the sexually arousing photographs
by finessisists September 19, 2018
Get the Blahhhh mug.