When you are savagely raw dogging a woman from behind, and apon completion, release your dogs (semen) into her kennel (vagina)
You should have seen me last night bro, I became the top dog
During cowgirl sex, with the girl on top, before the man ejaculates, he grabs her and wrestles her over, ejaculating on top of her to show dominance.
Jessica: "Josh did the Top-Dog Finishing move on me last night, it was SO hot."
Leader, especially in a prison where the top boy is called a Top dog.
Can't be selling drugs in prison without going through the Top dog.
Either you're one of those who tend to mispronounce "ToppDogg" (Don't worry, many people do) or you were talking about their song.
"Top Dog is so underrated!"
"You mean ToppDogg?"
"No I meant their song, but ToppDogg is too."