Dictionary / Vocabulary / できちゃった婚
できちゃったこん
marriage due to unintended pregnancy; shotgun wedding
Also written 出来ちゃった婚
できちゃった婚のため身内と大学の友人2人しかよばない地味婚にするそうです。
It seems as it was a shot-gun wedding so they're having a quiet wedding with only family and a couple of friends from university invited.
トムとメアリーは、できちゃった婚なのよ。
Tom and Mary had a shotgun wedding.
うちの親、できちゃった婚なのよ。
My parents only got married because they had me.