A lagback is that person in a group that manages to stay just far enough behind all the others, letting them do everythingand then enjoys in the rewards after having never contributed.
The group of survivors fought they're way thru many obstacles finallyreaching safety and during the entire ordeal the lagback managed to evade direct exposure to danger.
Laughtalk: A combination of laughing and talking. While laughing, a person will try to carry on a conversation. However, this attempt more that not fails, resulting in "laughtalk" or words unable to understand. "Laughtalking" usually results in more laughing due to the sheer humor of it.