Rhymes hotter than the sun, slay you like Summers do
(a reference to how vampires are said to be killed by the daylight, Vlad says his raps are as hot the sun - and therefore he will defeat Dracula much like the bright sunny weather of the summertime would. "Summers" has a double meaning here, referencing the vampire slayer Buffy Summers.)
Call both Abes to spit on your corpse when I'm through with you
(once he's defeated Dracula, Vlad will invite Abraham van Helsing, the vampire hunter from Bram Stoker's Dracula, and Abraham Lincoln, featured in Abraham Lincoln: Vampire Hunter, to spit on his body as a sign of disrespect)
Put a dhampir on your plans when I disembowel your son
(Vlad makes a pun on the phrase "put a damper on" using the word "dhampir," which is a half-human half-vampire. Dracula's son is a dhampir in various Dracula media, and Vlad threatens to kill him)
and while I'm still at Castle Drac, penetrate your brides just for fun
(when he's finished killing Dracula's son, he'll impale the three brides of Dracula. "penetrate" is also a sexual innuendo)
Might want to flee, Orlok the door, because I'm thirsting for fresh meat!
(Count Orlok was the name Dracula was known by in the classic film Nosferatu. Dracula makes a pun on "Orlok" by saying Vlad should either run away, "or lock" his door. Dracula can't hurt someone if they don't allow him into their house, which is why he advises Vlad to lock the door. "Thirsting" references Dracula's uncontrollable bloodlust, sometimes known as "the thirst")
No pulse! But my bloody flows are always on beat
(Dracula is undead, so he has no pulse. Despite his lack of pulse, his "bloody flows" are still "on beat," a play on "blood flow" and "heartbeat")
Fangs twice as sharp as this stick-wielding dummy
(Dracula insults Vlad's intelligence, with a play on "sharpness." Vlad impales his victims once with a pike, whereas Dracula leaves two punctures on his victims with his fangs, hence "twice as sharp")
My classic monstrous raps will leave you howling for mummy!
(a reference to Dracula's fellow classic movie monsters, the Wolfman and the Mummy)