Deaf drunk is when an intoxicated person talks louder than normal because he or she thinks people can't hear him/her.
Wow, that drunk guy is talking so loud, he's deaf drunk.
When your computer program isn't working right but when a friend or co-worker stands next to you, it starts to work, even though they hadn't done anything to assist you.
-Will you just come and stand next to my computer? I need some proximity tech support.
-Ah, thanks! Now its printing.