Suck face informal slang
The term is especially used to illustrate the act as distasteful to see.
To kiss voraciously and for a long time.
In spite of standing in a crowd, they still sucked face without caring about that.
Jane and his boyfriend are sucking face in the back house.
A happy couple is sucking face below the row of trees.
To be put in a bad mood
Used to refer to an unpleasant, repellent place, thing or person
To be difficult, troublesome, or unpleasant for someone; to be to someone's disadvantage.
The verb "suck" should be conjugated according to its tense.
Meaning absolutely certain or without a doubt
I am as sure as God made little green apples that Peter's the one for you, you two make a beautiful couple.