Top definition
Similar to IMs (Instant messages) When someone IMs you while high.
John: Heyy duuuude whats up maaaan

Mike: Dude i said enough with the High M's
by |WLF|DocGriffin August 25, 2009
Get the mug
Get a High M's mug for your fish GΓΌnter.
2
verb to hIghM - IM'ing someone while baked like pottery, stoned like concrete
Stop hIghM'ing your ex and let's play some XBox
by Barrack O'Baked June 14, 2010
Get the mug
Get a hIghM mug for your barber Nathalie.