Big Kids is a group of incredible friends. They are always there when you need them. Each member is extremely loved in the group. The Big Kids will provide you with your daily dose of serotonin. Clowning 24/7 is an important task for them.
A Big Kid Job is one's first job upon completing college or some other form of higher learning. Essentially, this job is the beginning of an actual career rather than continuing along a string of shitty, unprofessional, or unskilledpositions.
"Hey man, did you guys hear that Bob just got his first big kid job? No more boozing until 3 AM on Wednesdays for him . . ."
By Bellanca
Big Kid Pants
What a lot of people need to put on.
"Put on your big kid/girl/boy pants" means that the person who is being referred to is being immature and childish and won't man up.
"Matt challenged Jim to a fight for insulting his mother."