Top definition
when you see a hot girl and you dont have time to think and you penis is up
omg that girls tight ass gave me an instant boner

look at the instant bonerfying cleavage over there

i have a boner right now just so you know
by ieatmonkeybutt69 February 28, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
2
when u c a broad so sexc that ur dick juss pops up
oh shit check out that broad man instant boner
by mikeiliketoridedykes September 05, 2006
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug