When you expect something to be a certain way and have high expectations for it, and then it totally fails you.
Comes from expecting to hear 'lesbian
' but instead hearing lesbiak.
Two guys prepare to go over a massive speedbump at full speed, but when they hit it all they feel is a slight jolt.
"Dude, what a lesbiak speedbump"
"Totally man. Totally a lesbiak moment"