A "sunroof hamster" is not a recognized term in professional contexts. However, if used colloquially, it could metaphorically refer to a hamster, or a person (non-gender specific) exhibiting excessive and eager behavior to provide fellatio while their partner lays on top of a the vehicle with their hamster bits exposed through the sunroof.
In casual conversation, "sunroof hamster" might be used metaphorically to describe someone eagerly seeking attention or affection.
I asked to spice things up so she offered a ‘sunroof hamster’… wow!!
It’s like a Chicago Sunroof but with extra ingredients, after you defecate into somebody’s sunroof, you then shoot a giant jizzball into the hot stew. Vomit on it for a full effect.
Steve: Man my girl cheated on me with her cousin so I gave her a Sunroof casserole.
Henry: Jesus dude that’s disgusting
The sexual act of climbing on the roof while putting your penis through the sunroof as your partner performs oral. Looking like a hamster drinking from a bottle
Took my girl for a ride out in the country when we stopped she wanted to take advantage of the sunroof and try the Thirsty Hamster #Sunroof & Thirsty Hamster