Meaning of “DekiKon(デキ婚)”
“DekiKon(デキ婚)” means shotgun marriage.
It is an abstraction for Dekichatta(できちゃった)kekkon（結婚）.
In this case, dekichatta(できちゃった) means surprise pregnancy or unexpected pregnancy, and kekkon(結婚) means marriage.
These days, we also have Sazukari(授かり)kon(婚). The meaning is same, but we use this in good way.
Sazukaru(授かる) means be blessed with a baby, kind of.
A: He finally get married. I thought he want to enjoy his single life.
B: I’ve heard, it’s “DekiKon(デキ婚)”.
A: Oh, make sense.