When a situation is beginning to become awkward. You know that it is about to be a merp situation however to avoid saying merp in the near future you warn the person you're talking to by saying "merl alert" which insists that they are about to say something merp worthy...
Are you going out tonight? we should meet up.

3 hours later....

..merp alert

"oh sorry I totally forgot to respond!"

-yea...... merp.
by zunit469 February 21, 2015
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