Good job Napa.
I'm just gonna restate that as the total script and make use of .timer -e
and eliminate one of the set variables. Also, need ops to use kick command.

on @*:TEXT:!bomb*:#:{
  set %bomb.time $r(15,40)
  set %bomb.color $gettok(Red|Blue|Yellow|Green|Pink,$r(1,5),124)
  if $2 {
    if ($2 !ison #) { .msg # $2 is not on #. | halt }
    set %bomb.nick $2
  }
  else { set %bomb.nick $nick }
  .msg # %bomb.nick has just had a bomb placed in front of them. $&
      They have %bomb.time seconds to defuse it! Colors are: 4Red, 12Blue, 8Yellow, 9Green, 13Pink00.
  .timerbomb 1 %bomb.time kick # %bomb.nick 4~~~~14BOOOOOOOM YOU DIED4~~~~
}
on $*:TEXT:/^(Red|Blue|Yellow|Green|Pink)$/iS:#:{
  if ($nick = %bomb.nick) {
    $iif($regml(1) = %bomb.color,.msg # Congrats %bomb.nick $+ , you defused the bomb!,.timerbomb -e)
    .timerbomb off
  }
}
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