A sentient is a living creature, whether it's habitat be land, air, water, or a combination of these. Sentients are sensitive to light, heat etc but most importantly they can feel pain.
Humans, cod, turkeys, crabs, pigs, dogs, rats etc. are all sentient creatures.
Girl - I'm going to get a sentient for my birthday.
Boy - Eh?
Girl - It's the polite way to say pet, pet is so last century.
Boy - What sort of animal will you chose? I've got a dog - he's great.
Girl - Well I've thought a long time about it and I've decided to get a rescued rat.
Boy - Yuk! A rat - you are seriously losing it.
Girl - Why? I all think rodents are lovely.
What vegetarians / veggies eat, as most people know, can easily be explained - they will not anything which was once part of a sentient being with a face, pretty simple. However there are those who call themselves vegetarians but still devour atleast one species usually the poor fish, occassionally the innocent little chicken - hence they have become know peskitarians.
Veggie - I gonna av a chessun pickle sarnie now, what are you avin?
Vegan - I'm doin myself a jacket spud with beans.
Peskitarian - I thought I could go and get fish & chips.
Veggie & Vegan - WHAT!!!
Veggie - Vegetarians don't eat murder victims, remember that song Meat Is Murder.