Non-verbal cues that your partner is ready to "get busy". Traditionally, bedroom eyes refer to a heavy-lidded or half-shut eye meant to look almost dreamy. When executed properly, they can be used to signal an interest in becoming more intimate. It can also be used to describe a person who looks at someone else with lust.
Additionally, this can refer to a style of eye makeup that intends to look seductive.
Cameron didn’t want any confusion about whether or not he was giving Tina bedroom eyes. He wanted her, and both a seductive smile and prolonged eye contact spelled out the same outcome: Tina coming home with him that night.