bywalker

No such word. You probably mean passerby.

I'd go with "passerby". Another option might be "bypasser", but that doesn't necessarily mean the bypasser is walking, so you could fit in the word "pedestrian" somehow.

I agree on passerby.+ To +bypass is to go around something, to detour, or to circumvent (such as to bypass a law).

A "bypasser" to me would be someone trying to walk around the people who are eating--for example, a big table has been set up in front of a house and you have to step off the sidewalk and into the street in order to go around the diners.

In any case, "bypasser" is not a common word.

Another option might be "bypasser"

What on earth? Not in any variant of English I am familiar with.

For 99.9% of English speakers, a "bypass" is a way around an obstruction (e.g. "coronary bypass") so a "bypasser" would someone or something that passes an obstruction. I do find exactly one dictionary reference to "bypasser" as a variant of passerby , but can find no examples whatsoever of anybody actually using the word that way.

What on earth?
No problem zash, I do understand that not everyone is as familiar as I am with the English language as it's spoken in various countries. Just because you've never heard it, doesn't mean it's not an option. I'll let the OP decide that. Like I said, passerby was my first choice.

Where did you come across the word bypasser, misterbee?

I would prefer "and smile at you as you walk by." Or "and beam at you as you walk by." Not "beam a smile" and not any noun in apposition with "you".

Are you serious?
You've never heard the word bypasser?
You have to get out more.

You've never heard the word bypasser? You have to get out more.

Vinny asked you a question. Do you intend to answer it?

"Bypasser" is flagged as spelling mistake in MS Word in their American, British, and Australian English dictionaries (I checked). Oxford Dictionaries online doesn't include a definition for the word. I was, however, able to find a handful of references to it in newspapers. Searching The Guardian, for instance, yielded 8 hits (compared to 3,500 hits for passerby); the New York Times yielded 14 hits (compared to 11,000 hits for passerby).

While even a tiny number of hits justifies you calling "bypasser" a legitimate dialectical variant, it's reasonable to ask where you came across such an unusual locution, unknown to most of the English-speaking world.

Where did you come across the word bypasser, misterbee?