Without even having any knowledge of the situation, he started jiving him about it.
この場合、次のような言い方ができます。
ーWithout even having any knowledge of the situation, he started jiving him about it.
「彼はその状況の知識もないのに、彼にいい加減なことを言い始めた」
別の例：
ーHe kept jiving his little brother until he made him cry.
「彼は弟が泣くまでからかい続けた」
to jive には「人をからかう・バカにする」という意味もあります。
ご参考まで！
A certain individual was jiving him despite not knowing anything.
"ある人は知識もないのに彼にいいかげんな事を言った"
- A certain individual was jiving him despite not knowing anything.
- There was a person who was jiving him even though he had no knowledge on the topic.
- They didn't know anything yet they kept jiving him.
カナダ 
アメリカ合衆国 
