A noob question

[GrassHopperAA]

in front means they act before you.

behind means they act after you.

No one is behind the button. No one is in front of first to act.
"I got bottom two pair with a bet and raise in front of me"
"A loose player bets, I have top pair weak kicker, but two guys to act behind me"

On a side note, in a Vegas casino, if a player buys chips and has not recieved them(if a person is going to the cage to bring him chips), then he is that much behind (e.g. seat 3 is 500 behind).