Swhap is NOT pronounced like "swap", which is why it is spelled with an "h". Swhap rhymes with words like "slap" and "flap" and should be pronounced like that.
To swhap is to pleasure a woman's vagina, usually in a rubbing motion on her pussy and sometimes, more specifically, her clitoris. This word can be used in tandem with "flap" as swhapping can be done along the flaps of a woman's vagina, more informally known as her pussy lips. It has the added bonus of rhyming with "flap" which makes the term sound borderline outrageous but memorable nonetheless.

lil mad is like big mad but the opposite, you mad but not mad to the extent of pullin somthin