phone gap

in slow, heavy traffic, it’s the wide gap created between cars by someone who doesn’t move because they’re distracted by their phone. Very convenient for changing lanes

I can change lanes with the phone gap that just opened up, so I won’t miss my exit

goober gap

A goober gap is the space between someones goggles and helmet. Usually ending up with a odd lookin windburn

Man did you see the size of that gorbs goober gap

Gap Moe

A character that looks moe, and doesn't behave moe
or, a character who looks mature but behaves in a cutesy way

Even though it contains the word moe in it, this also can be used in general
for any type of character whose looks are opposite to their personality/behavior.

Midori Takamine's body grew faster, in contrast to his shy and insecure self.

Tanya Degurechaff can look like a cute kid, but in reality they're a 42 year old sociopath.

Both are a prime example of what 'Gap Moe' means.