You get the two manly-ist tools on the planet and combine them in one..
Therefore you have the manly-ist tool of them all.
This describes, anything manly, pure awesome, cool, rad, sweet, tight or simply add it to any sentence to make it more manly, just because you can.
*warning, overusage may make you a tool or a fag or the manly-ist of them all.
"Hey bro. Did you see the tits on that mamacita? Those shits is HammerSaw!"
"Hey man, did you see that bikers' hog?! He had those fake chrome man balls on the back, that guy is sooo HammerSaw."
"That rav4 just got 90 feet of air off that double double.
Damn, one word.... HAMMERSAW!"