look up any word, like dirty sanchez:
 
1.
A grammatical error, such as the confounding of "it's" and "its", "you're" and "your", and "their" and "they're". Whereas a typo is a careless blunder caused by clumsy fingers, a grammo suggests a lack of understanding of the English language.
I hate when people try to pass off their grammos as typos.
by Stephen White March 30, 2008
 
2.
A grammatical error, such as the confounding of "it's" and "its", "you're" and "your", and "their" and "they're". Whereas a typo is a careless blunder caused by clumsy fingers, a grammo suggests a lack of understanding of the English language.
I hate when people try to pass off their grammos as typos.
by Stephen White April 01, 2008