It doesn’t mean anything. It’s just a load of old rubbish that someone asks you what it means without giving an answer and refuses to tell you because he/she doesn’t know what it means either.
Person: “Hey, do you know what ‘Her Mexican’ means?”
You: “What?”
Person: “Her Mexican”.
You: “No?”
Person: “Ha, you don’t know what it means, see ya!”
You: “?? Wft?”
You: “What?”
Person: “Her Mexican”.
You: “No?”
Person: “Ha, you don’t know what it means, see ya!”
You: “?? Wft?”
by Dozy_Leo February 13, 2018
Get the her mexicanmug. 
by AMALIE STEPMUM August 10, 2023
Get the ‘This is her’ picmug. It is a substitute for haha
by Darren c-bell September 4, 2010
Get the Ter Hermug. by COOMSOCK April 13, 2022
Get the PIPE-HERmug. 
When you bust a nut in a girls face and spit on her at the same time turning you into the llama llamaing her
by stinkyYOSHI6336 March 18, 2019
Get the Llama hermug.