Mispronunciation of the word "strength"; typically by African Americans due to the difficulty of it's phonetic structure. Similar words include but are not limited to: "Shrimpf" (shrimp), "acts" (ask), and "birfday" (birthday).
This act requires you to remove your clothes while lifting a naked man above your head who's wearing a party hat on his genitals. While doing this a school boy octopus rubs your nipple from behind and places a tentacle inside the man above your head.
I'm going to down to the localfish market to acquire an octopus for some Strumph Diddling tonight.
JT:Hey dude how was your date last nite.
melmac: awful dude i was giving her the best anal sucking vacuum and then i got strewmphed.
JT: Oh dude, gl next time.