Lyric discussion by Elin 

Cover art for It'5! lyrics by Architecture in Helsinki

Perhaps it's about him being at a party with 4 people and wine, and at the party is a girl he likes. So he's hoping that he and her will become a couple.

"Could've sworn that wine and one and four made two, But It's 5!"

Don't know if that made any sense. Hard to explain in English. Or maby he just thinks he's seeing double from the wine. I don't know. An interesting line. Maybe it doesn't mean anything at all.