jessjwoof
Favorite Answer
Impossible question. You have not given us the context of this phrase.
Best I can come up with is that you only have a 1/3 of the Riddle of the Spinx.
What walks on 4 legs in the morning, 2 legs throughout the day, and 3 legs in the evening?
That riddle drove me nuts until I figured it out.
john wondering
If one what walks on two legs?
olderman
Just be careful; who's legs you walk on...
?
a) the person has both legs
b) the person might be tired at the end of the day
cryptic_non_sequitur
it means they are bipedal on that given day