What does it mean when someone say “ awkward grammar “ ?

Does it mean wrong grammar or something entirely different ?

My understanding of the word “ awkward ”

Is something uncomfortable like I had an awkward conversation with someone.

Question

What does it mean when someone say “ awkward grammar “ ?

Does it mean wrong grammar or something entirely different ￼? ￼

My understanding of the word “ ￼awkward ”￼

Is something uncomfortable like I had an awkward conversation with someone.

Answer

What does it mean when someone says “awkward grammar “ ?

It means that it may not be technically incorrect, but it is not a clear or natural way of saying what you are trying to say.

Example:

NATURAL: I like K pop music. 
AWKWARD:  The style of music that causes aural pleasure to my ears is that which is called K pop.

Awkward sentences are often more complicated that good/natural sentences.

Answer

I agree with Dan's response and would add that often "awkward" is used to describe grammar that doesn't sound like a native speaker would use. Some sentences feel wrong to native speakers but we can't exactly say why, or why it's "wrong."

Here's an example of a grammar rule that most native speakers only know intuitively:
https://www.theguardian.com/commentisfree/2016/sep/13/sentence-order-adjectives-rule-elements-of-eloquence-dictionary