Though is not such a common onomatopoeia, it would describe a loud and coarse kind of laugh mostly (but not always) produced by men of the same kind.
We already have and for laughing sounds which are far more common and this fact enables one to guess what would mean even if one had never heard/seen it (just as @Chocolate's comment above would suggest).
would definitely **not** be a quiet, well-mannered, refined or classy kind of laugh. These 'gentler' qualities are rarely, if ever, expressed by onomatopoeias containing a , , , or .
IMHO, this topic is somewhat related to this Q&A in terms of how certain sounds feel to the native speakers.