I was talking to my dad about modern slang...

I was talking to my dad about modern slang...

...and I brought up the phrase 'Being salty'. He wonders for a moment and I explain, 'It's commonly used for when someone's angry at something, just really livid.'

'Oh yeah! I've heard that before. It's an old sailing term.' He replies.

'It is?'
'Yeah, you know, it's an old seaman term.'