Aw man, you have no idea how much this irritates me!
Awe means wonder (no, not like Stevie Awe) or even dread. To be in awe of something is to be inspired. “I’m in awe of this new flux capacitor I found on eBay.”
Aw is something that’s cute, or disappointing. “Aw, your baby’s adorable.” or “Aw, there aren’t any more Oreos.” I’ll even accept an extra w on the end, but no e’s!
I’m amazed how often I see “awe, I’m so happy for you” type exclamations lately.