To be on your "TenToes" is to be aware of your surroundings.
Person 1: Be safe bro
Person 2: Im always on my tentoes.
A person that is afraid of toes
Especially toe pics
Tento: I'm Tento
Patrick: What's a Tento
SpongeBob:It means he's afraid of toes
Tento: No it doesn't
Patrick:Send toe pics
SpongeBob:Stop Patrick you're scaring him