A Slip of the thumb - A thumb slip is when you swear in sign language because you’

A thumb slip is when you swear in sign language because you’re too dumb to know what you’re doing.

I was trying to sign hello, and I ended up signing ‘I hate your mom.’ My friend laughed so hard he cried.

I thought I was saying ‘I’m fine,’ but I actually said ‘I’m going to punch you.’

I was trying to say ‘good job,’ but it came out as ‘I’m going to beat you up.’ My teacher was confused.