[fûrst pān'kāk'] noun
The oldest child who usually lacks social skills that their younger siblings have. Taken from saying that the first pancake cooked generally doesn't turn out because the griddle is still heating up. A first pancake doesn't have an older sibling to watch go through the basic firsts of life and instead must figure them out for his or herself, leaving him or her in many awkward, scary situations. They feel behind compared to most of their peers in areas such as dating, never really figuring out what exactly is wrong with them.
Wow, she's never had a relationship, she must be a first pancake.
He's so naive, I bet he's a first pancake.
See guinea pig, experiment child.